Federal agents are still searching for a motive on Monday — two days after Thomas Matthew Crooks shot and wounded former President Donald Trump in an assassination attempt.

Agents wearing shirts emblazoned with “Pittsburgh Bureau of Federal Investigation” have spent the morning speaking to the Crookses and their neighbors, brandishing their badges at the front door.

“They asked questions I didn’t really have answers to. I’m not really one to go around talking to my neighbors,” said Kelly Little, 38, who has lived across the street from the Crookses’ modest one-story brick house since 2018.

“They asked if I knew them or if I’d seen anything out of the ordinary. I didn’t have any great answers for them.”

Law enforcement sources told The Post that investigators are waiting for details from Crooks’ phone and computer to help them determine why he fired on Trump at Saturday’s rally on Saturday.

The search of his devices was delayed after investigators found possible explosive devices in Crooks’ car and at his home, the sources said.

While speaking to agents, Little said, she learned for the first time of the existence of Crooks’ older sister, Katherine.

“Evidently the kid has a sister. I had no idea. I had no idea she existed,” Little told The Post.

“I’ve definitely seen her around, it makes sense but I never connected it,” she said.