COLOMBO, Nov 21 (Reuters) - Sri Lanka's Tamil Tiger rebels said on Tuesday Air Force fighter jets dropped bombs near their northern stronghold of Kilinochchi, but said they did not yet have any details of damage or casualties. "We are being bombed," rebel military spokesman Rasiah Ilanthiraiyan told Reuters from Kilinochchi. "The bombs are falling near Kilinochchi. The buildings in town are vibrating." "They have dropped about 20 bombs so far," he added. "There was no provocation." The military said it had no immediate details of any air raids.