Joker had situated the explosives in the basement of one of the apartment complexes, strapping them to the support beams, then putting barrels of gunpowder in empty upstairs apartments. He did all of this from a back alley, attempting to keep it all hidden from the skies. He looked up, seeing a shadow against the sky.
The clown closed up the entrance to the basement of the complex, walking swiftly towards the main street, he pulled the detonator out of his back pocket, turning the knob on it while keeping an eye on the skies, he hummed;
"Tra-la-la BOOM" he pressed the first lever, blowing part of the apartment complex wide open, he laughed hysterically, "di-yay," he held in a laugh, charging the next one, "Tra-la-la BOOM" he flicked the other switch, blowing another part out of the apartment building, he peered upward before fingering the third switch,looking for Bats, he pressed it, not hearing a boom, he rolled his eyes, pressing it repeatedly, "Dammit...frickin' detonator.." he pulled the back off of it, examining the wires.