On 28 August, a VRS mortar attack on the Sarajevo "Markale" marketplace killed 43 people. In response to the second Markale massacre, on 30 August, the Secretary General of NATO announced the start of Operation Deliberate Force, widespread airstrikes against Bosnian Serb positions supported by UNPROFOR rapid reaction force artillery attacks. On 14 September 1995, the NATO air strikes were suspended to allow the implementation of an agreement with Bosnian Serbs for the withdrawal of heavy weapons from around Sarajevo. Twelve days later, on 26 September, an agreement of further basic principles for a peace accord was reached in New York City between the foreign ministers of Bosnia and Herzegovina, Croatia and the FRY. A 60-day ceasefire came into effect on 12 October, and on 1 November peace talks began in Dayton, Ohio. The war ended with the Dayton Peace Agreement signed on 21 November 1995; the final version of the peace agreement was signed 14 December 1995 in Paris.