An explosion late Friday damaged a key aqueduct in Kosovo that sends water to the country’s two main power plants, prompting allegations and recriminations with neighboring Serbia amid rising tensions in the region. Pristina labeled the blast a “terrorist attack” by neighboring Serbia, a charge that Belgrade quickly called “baseless.” A sprawling police raid across northern Kosovo hours after the attack uncovered more than two hundred military uniforms, anti-tank grenade launchers, Kalashnikovs and Russian and Serbian army patches, Kosovo authorities said. “This is the single most serious attack on the country’s critical infrastructure since the end of the conflict in…