(CNN) -- Pirates have hijacked two European-owned chemical tankers off the coast of Somalia in the past 24 hours, the European Union Maritime Security Center said Thursday.



The 23,000-ton Norwegian-owned and Bahamian-registered M/V Bow-Asir was captured 250 miles east of the southern Somali city Kismayo on Thursday morning, the security center said in a release.



The M/V Nipayia, a 9,000-ton Greek-owned and Panamanian-registered vessel with 19 crew members, was attacked approximately 450 miles east of Kismayo on Wednesday afternoon, the security center said.



Officials have issued an alert site notifying all vessels in the area to be aware of the increase in pirate activity.
Who hijacked two European-owned chemical tankers? How much does the M/V Nipayia weigh? How much did the ship weigh? What other vessel was taken? How much did the Greek ship weigh? What did the pirates hijack? What was captured? What was the size of the tanker hijacked?
Pirates 9,000-ton 23,000-ton M/V Bow-Asir 9,000-ton two European-owned chemical tankers two European-owned chemical tankers 23,000-ton
question: Who hijacked two European-owned chemical tankers?, answer: Pirates | question: How much does the M/V Nipayia weigh?, answer: 9,000-ton | question: How much did the ship weigh?, answer: 23,000-ton | question: What other vessel was taken?, answer: M/V Bow-Asir | question: How much did the Greek ship weigh?, answer: 9,000-ton | question: What did the pirates hijack?, answer: two European-owned chemical tankers | question: What was captured?, answer: two European-owned chemical tankers | question: What was the size of the tanker hijacked?, answer: 23,000-ton