present. Local Serb forces managed to complete their cleansing of the UNPA areas, started in 1991, that left only 279 Croats there out of a pre-war population of 102,000. The situation was problematic, mostly due to non-cooperation by local Serb authorities, and because of later major Croat military offensives. Additionally, the situation for which UNPROFOR had been designed and anticipated for had significantly changed. The Croat side now refused to negotiate its sovereignty on the UNPAs and Pink Zones, which the Serb part would not accept. Establishment of the "Republic of Serbian Krajina" further complicated the situation. The Opening of the Sarajevo Airport was conducted by the Canadian Operational Force, which moved within the Theater of Operations from Croatia (Surac) to the combat zone of Sarajevo. The Canadian Force included the French-speaking Royal 22e Régiment, with the attachment of N Company of the English-speaking 3rd Battalion, The Royal Canadian Regiment. The Canadian Contingent was deployed by train from Canadian Forces Base Baden-Soellingen and CFB Lahr, Germany. In spite of hostile actions, Sarajevo international airport had successfully remained open. In the period from 3 July 1992 to 31 January 1993, the humanitarian airlift organised by UNHCR under UNPROFOR protection brought in 2,476 aircraft carrying 27,460 tons of food, medicines and other relief goods. Distribution of humanitarian aid was disrupted due to non-cooperation and even hostile actions (mines, small arms fire, RPG) of the parties in the field, especially from the Bosnian Serb forces. Nonetheless, from November 1992 to January 1993, a total of some 34,600 tons of relief supplies had been delivered to an estimated 800,000 beneficiaries in 110 locations throughout Bosnia and Herzegovina. March 1993 – February 1994 Croat incursions On 6 July 1993, new tensions arose following the Croatian government's decision to re-open the strategic Maslenica bridge on 18 July – Croatia was cut in half while the bridge was in Serb hands. The UNPROFOR forces who were mandated to monitor the Croat forces' withdrawal from the area had been unable to deploy, due to the refusal of access by Croat authorities. The Serbs shelled the bridge, partially destroying it on 2 August. On 12 August, negotiations for a cease-fire began in Geneva, but were unsuccessful. Eventually, Croat forces retreated to their positions previously occupied before the incursion. Operation "Deny Flight" In mid-March, unidentified airplanes dropped bombs onto villages in the vicinity of Srebrenica, violating the "No-Flight zones" for