This is so simple. Bomb and shell the place with some sort of “sleeping gas”. That wont kill anyone but will put everyone to sleep for several hours. Then they go in without a fight and separate the bad guys from the good guys, if there are any. Don’t tell me they don’t have bombs like that. If they don’t, why the hell don’t they.
Reports are that you are correct. The militants are holed up in the basement, an ideal place for gas.