opinion: BOWNES, Circuit Judge.
  This case raises the question whether a suit attacking the cancellation of a performance bond and other guaranties during the foreclosure of a mortgage arises out of a transaction “involving . . . banking” within the meaning of the jurisdictional statute 12 U.S.C. § 632.
  Appellants, plaintiffs below, are Pedro Juvenal Rosa and Rosario Amador de Rosa, suing individually and as a conjugal society. They allege that they sold a parcel of land to Torre de Caparra Corp. (TCC), receiving cash and a first mortgage in the amount of $111,500 at six percent interest. TCC also mortgaged the property to Continental Mortgage Investors and one of the defendant-appellees, Chicago Title Insurance Co. (CTI). Under its mortgage, CTI guaranteed completion of construction of an apartment building on the land and issued a performance bond with a third party beneficiary clause in favor of plaintiffs guaranteeing that plaintiffs would collect their mortgage credits. Plaintiffs allege that on the basis of CTI’s representations about these guaranties, they subordinated their mortgage to that of CTI. TCC then entered into a refinancing agreement with the other defendant-appellee, First Federal Savings & Loan Association of Puerto Rico (First Federal). Plaintiffs subordinated their mortgage to First Federal’s new mortgage on the condition that the performance bond and guaranties of completion by CTI would remain in effect. Defendants, according to plaintiffs, then cancelled the bond and guaranties. First Federal foreclosed on its mortgage; plaintiffs received nothing.
  Plaintiffs brought suit in federal court, asserting that jurisdiction lay under 28 U.S.C. § 1332 (diversity) and 28 U.S.C. § 1337 (federal statutes regulating commerce). They later amended the complaint to add an additional jurisdictional ground, 12 U.S.C. § 632. The district court denied jurisdiction under section 1332 because of lack of complete diversity and under section 1337 because plaintiffs asserted no claim under a federal statute. As to section 632, the district court determined that it did not apply because Puerto Rico is not “a dependency or insular possession of the United States” for purposes of acts relating to national banks. Conjugal Soc’y v. Chicago Title Ins. Co., 497 F.Supp. 41 (D.P.R.1979). We reversed on the section 632 ruling. Conjugal Soc’y v. Chicago Title Ins. Co., 646 F.2d 688 (1st Cir. 1981) (per curiam); see First Fed. Sav. & Loan Ass’n v. Ruiz de Jesus, 644 F.2d 910 (1st Cir. 1981). On remand, the district court concluded that jurisdiction still did not lie under section 632 because plaintiffs had alleged fraud, which sounded in tort and which did not come within “traditional banking activities,” the only transactions encompassed by section 632, Diaz v. Pan American Fed. Sav. & Loan Ass’n, 635 F.2d 30, 32 (1st Cir. 1980). Conjugal Soc’y v. Chicago Title Ins. Co., 525 F.Supp. 268 (D.P.R.1981).
  The procedural mechanism for dismissal below was a Fed.R.Civ.P. 12(b)(1) motion by defendants. The district court based its order on a reading of the complaint, and, accordingly, “we consider only those facts and allegations set forth in the complaint and must view them in a light most favorable to the plaintiff,” Harper v. Cserr, 544 F.2d 1121, 1122 (1st Cir. 1976) (reviewing 12(b)(6) order). We have no occasion to address a subsidiary point raised briefly by plaintiffs, whether they were improperly precluded from introducing evidence on the jurisdictional issue.
  We recently considered the scope of section 632 in Diaz v. Pan American Fed. Sav. & Loan Ass’n, 635 F.2d 30. We held that a district court could not entertain, under section 632, a suit that charged the malicious or negligent filing of a criminal complaint as a result of plaintiffs alleged passing of bad checks. Id. at 32. Section 632 reaches only traditional banking activities, not all cases in which a bank organized under federal law is a party. Id. Banking activities covered by section 632 include mortgage agreements, see 12 U.S.C. § 1464(c) (federal savings and loan associations), and foreclosures on mortgages, Chase Manhattan Bk. (N.A.) v. Corporacion Hotelera, 516 F.2d 1047, 1048 n.1 (1st Cir. 1975) (per curiam); First Nat’l City Bk. v. Gonzalez & Co. Suer. Corp., 308 F.Supp. 596, 599 (D.P.R.1970); see First Fed. Sav. & Loan Ass’n v. Zequeira, 305 F.Supp. 37, 39 (D.P.R.1969). But cf. Gonzalez-Roman v. Federal Land Bk., 303 F.Supp. 482, 483 (D.P.R.1969) (action challenging prior foreclosure proceeding was attack on earlier federal judgment and did not arise from transaction involving banking). Section 632 is not limited to the original two parties to a banking transaction. In Corporacion Venezolana de Fomento v. Vintero Sales Corp., 629 F.2d 786 (2d Cir. 1980), cert. denied, 449 U.S. 1080, 101 S.Ct. 863, 66 L.Ed.2d 804 (1981), the guarantor of notes sold by the maker to obtain letters of credit from a bank was allowed to sue the bank under section 632 for allowing alleged wrongful drawdowns against the letters, id. at 792. Section 632 jurisdiction also exists over a claim by one cosignor of a letter of guaranty against another cosignor contesting the validity of the letter, when the letter was relied upon by a bank in granting a loan. National City Bk. v. Puig, 106 F.Supp. 1, 2-3 (D.P.R.1952).
  According to the complaint in the instant case, plaintiffs agreed to a subordinate mortgage position in exchange for protection — a performance bond and a guaranty of completion — offered by defendants. The seniority of defendants’ mortgages was an important factor in the mortgage transactions that defendants entered into; indeed, First Federal is effectively required to take only first mortgages, see 12 C.F.R. § 545.6(a), (b)(1). Plaintiffs have no unconditional rights or obligations directly under the mortgage agreements between TCC and CTI and between TCC and First Federal, but they are third parties whose subordinate position was central to CTI’s and First Federal’s decisions to enter into the mortgage agreements. Cf. Corporacion Venezolana de Fomento v. Vintero Sales Corp., 629 F.2d 786; National City Bk. v. Puig, 106 F.Supp. 1. Defendants’ assurances to plaintiffs thus constituted part of defendants’ banking transactions, and the alleged wrongful termination of those assurances was part of the mortgage foreclosure.
  CTI suggests that section 632 jurisdiction is absent because the gist of plaintiffs’ claim is negligence and conspiracy which by themselves bear no relationship to banking. Plaintiffs allege essentially, however, that they were denied rights provided by the guaranty and the performance bond. Whether' defendants’ acts are viewed as ones in tort or contract, plaintiffs’ rights are alleged to have arisen out of defendants’ mortgage agreements and thus out of a transaction involving banking within the meaning of section 632. Plaintiffs have alleged facts sufficient to invoke section 632 jurisdiction.
  Reversed and remanded.
  . 12 U.S.C. § 632 provides in relevant part as follows:
  Notwithstanding any other provision of law, all suits of a civil nature at common law or in equity to which any corporation organized under the laws of the United States shall be a party, arising out of transactions involving ... banking in a dependency or insular possession of the United States, ... shall be deemed to arise under the laws of the United States, and the district courts of the United States shall have original jurisdiction of all such suitsf.]
  . The relevant paragraphs of plaintiffs’ complaint are as follows:
  14. The mortgage in favor of CTI was to guarantee, among other things, obligations assumed by CIT [sic] whereby it would finish the apartment building in the event that Torre de Caparra Corp. was unable to do so for whatever reasons.
  15. In exchange of the mortgage constituted in its favor and as a reciprocal obligation, the defendant, CTI issued a performance bond number CH-1225-53-0131-2 whereby it guaranteed to the plaintiffs collection of its mortgage credits.
  19. As a condition to its banking transaction First Federal obtained of the plaintiffs the further subordination of the first mortgage held by plaintiffs.
  . The following paragraphs of plaintiffs’ complaint are relevant:
  27. The cancellation of the performance bond and the protections offered and accepted by the plaintiffs for subordination of their mortgage credits were all part of a design and plan to defraud within a banking transaction on the part of the defendants.
  28. The cancellation of the performance bond execution of the mortgage credits and subsequent negotiations by the defendant, First Federal[,] were all part of a design and plan of a banking transaction.
  29. As a result of the leaving without effect and cancellation of the performance bond by the defendants, the plaintiffs were deprived of their mortgage credits in the amount of $111,500.00, plus interest on that amount.
  30. As a result of the fault, acts and negligence of the defendants, the plaintiffs have suffered losses in the amount of $500,000.00.
instruction: What follows is an opinion from a United States Court of Appeals.
  Intervenors who participated as parties at the courts of appeals should be counted as either appellants or respondents when it can be determined whose position they supported. For example, if there were two plaintiffs who lost in district court, appealed, and were joined by four intervenors who also asked the court of appeals to reverse the district court, the number of appellants should be coded as six.
  In some cases there is some confusion over who should be listed as the appellant and who as the respondent. This confusion is primarily the result of the presence of multiple docket numbers consolidated into a single appeal that is disposed of by a single opinion. Most frequently, this occurs when there are cross appeals and/or when one litigant sued (or was sued by) multiple litigants that were originally filed in district court as separate actions. The coding rule followed in such cases should be to go strictly by the designation provided in the title of the case. The first person listed in the title as the appellant should be coded as the appellant even if they subsequently appeared in a second docket number as the respondent and regardless of who was characterized as the appellant in the opinion.
  To clarify the coding conventions, consider the following hypothetical case in which the US Justice Department sues a labor union to strike down a racially discriminatory seniority system and the corporation (siding with the position of its union) simultaneously sues the government to get an injunction to block enforcement of the relevant civil rights law. From a district court decision that consolidated the two suits and declared the seniority system illegal but refused to impose financial penalties on the union, the corporation appeals and the government and union file cross appeals from the decision in the suit brought by the government. Assume the case was listed in the Federal Reporter as follows:
  United States of America,
  Plaintiff, Appellant
  v
  International Brotherhood of Widget Workers,AFL-CIO
  Defendant, Appellee.
  International Brotherhood of Widget Workers,AFL-CIO
  Defendants, Cross-appellants
  v
  United States of America.
  Widgets, Inc. & Susan Kuersten Sheehan, President & Chairman
  of the Board
  Plaintiff, Appellants,
  v
  United States of America,
  Defendant, Appellee.
  This case should be coded as follows:Appellant = United States, Respondents = International Brotherhood of Widget Workers Widgets, Inc., Total number of appellants = 1, Number of appellants that fall into the category "the federal government, its agencies, and officials" = 1, Total number of respondents = 3, Number of respondents that fall into the category "private business and its executives" = 2, Number of respondents that fall into the category "groups and associations" = 1.
  Your task is to identify the state of the first listed state or local government agency that is an appellant.
choices: not Alabama Alaska Arizona Arkansas California Colorado Connecticut Delaware Florida Georgia Hawaii Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachussets Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New New New New North North Ohio Oklahoma Oregon Pennsylvania Rhode South South Tennessee Texas Utah Vermont Virginia Washington West Wisconsin Wyoming Virgin Puerto District Guam not Panama