year, the warring parties attempted to come to a cease-fire. The truce was implemented between Croat and Serb forces, but fighting went on in Bosnia between Bosniaks and Croats, and the humanitarian situations continued to deteriorate. Notably, Sarajevo continued to be bombarded by Bosnian Serb forces. It was also reported that regular Croat army units were supporting Bosnian Croat forces with heavy equipment and men, removing their insignias. This led to further protests from the UN. Use of force began to be discussed at a NATO summit held in Brussels on 10 and 11 January 1994. The Bosnian Serbs, following talks with high-ranking officials of the Russian Federation in Moscow, agreed to open the Tuzla airport for humanitarian purposes. At the same time, the relieving of UN troops in Srebrenica was allowed and the Canadian contingent was replaced by a Dutch contingent. The situation in Sarajevo, however, remained extremely tense, with Bosnian Serb sniper fire deliberately aimed at civilians, and artillery and heavy mortar fire aimed at population areas. This strongly shaped Western public opinion, as a number of journalists were operating in Sarajevo, and murdered civilians were seen on the evening news on a regular basis. On 4 February 1994, a mortar shell struck a suburb of Sarajevo, killing 10 people and wounding 18. The next day, 5 February 1994, a mortar exploded in Sarajevo's Markale market, leaving 68 dead and 200 injured in what was so far the bloodiest incident in Sarajevo in 22 months of fighting. Exasperation at these provocations grew to the point where an ultimatum was sent, requiring the removal or surrender to UNPROFOR of all heavy guns 20 km from Sarajevo (Bosnian and Bosnian Serb, with an exception for Pale) within ten days. The ultimatum was satisfied on 17 February, with the heavy weapons that were not removed being regrouped in seven UNPROFOR-controlled spots. On 23 February 1994, the cease-fire was brokered between Croat and Bosnian forces – the Washington Agreement – which ended their one-year-long war and united the sides as the Federation of Bosnia and Herzegovina. UNPROFOR's role in this was to monitor the cease-fire, help rebuild local infrastructure, and staff checkpoints within the federation area. March 1994 – November 1994 Positive developments and extension of mandate On 24 March 1994, a plan for the re-opening of the Tuzla airport, for UNPROFOR and humanitarian use only, was published. On 29 March 1994,