A few hours after the 2nd Alarm, calls were received by the Bridgeport ECC reporting smoke coming from 18 Jones Ave, the original fire building. Again, a David-4 assignment consisting of Engine 4, Engine 1, Engine 3, Engine 16, Ladder 5, Ladder 11, Safety Officer 1, Battalion 1, and Battalion 2 responded. Car 3 and FM-6 also responded. Battalion 1 arrived to find heavy smoke showing from the 3rd floor of the fire building. Companies progressed inside to find heavy fire on the 3rd floor, which was quickly knocked. Companies checked for extension and worked on extensive overhaul for over an hour. The Fire Marshal's office is investigating the cause of the rekindle