Sri Lanka's Tamil Tigers said the army killed 5 civilians and injured 18 in a rocket attack on Wednesday, as the government vowed to win control of a water source at the centre of the worst fighting since a 2002 truce, Reuters reported. Water flowed to thousands of farmers in east Sri Lanka for the first time in three weeks on Wednesday after truce monitors confirmed the Tigers had reopened a blocked, disputed sluice the previous night -- an apparent olive branch to halt the fighting. But the government said it would not end its campaign until it controlled the sluice and a reservoir used for irrigation located in an area both sides claim as theirs. Truce monitors say the Tigers have de facto control. "Our concern is control of the water should be under the government," said government defence spokesman Keheliya Rambukwella. "If it is under the terrorists, as and when they want they can open and close it. "We don't want any interruption in the water, and therefore the forces are in and around and will be taking control."