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				 The casualties, some of the worst losses for Kiev in days, 
				underscore the fragility of a two-week old ceasefire agreed 
				between Kiev and the rebel leaders in eastern Ukraine in a 
				conflict that has killed about 6,000 people. 
				 
				The military source, speaking on the condition of anonymity, 
				gave no further details. A military spokesman said earlier that 
				rebels had shelled Ukrainian positions 22 times over the past 
				day. 
				 
				Both Europe and the United States have voiced hope that the 
				Minsk accords agreed last month could lower tensions in a 
				conflict that has brought ties between Russia and the West to 
				their lowest since the Cold War. 
				 
				Ukraine and the rebels accuse each other daily of shooting at 
				each others' front line positions. This has slowed 
				implementation of the new Minsk peace agreement, part of which 
				also envisages the withdrawal of heavy artillery. 
				 
				The rebels have invited members of the media to witness guns 
				being led away from the front line, but the Organization for 
				Security and Cooperation in Europe (OSCE) says it cannot confirm 
				the withdrawal of weapons as they have not been given access to 
				see where the guns have been relocated. 
				 
				(Reporting by Pavel Polityuk, Writing by Thomas Grove; Editing 
				by Lidia Kelly and Tom Heneghan) 
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