A top-ranking Republican congressman said yesterday he expects the feds to make more arrests in their ever-widening probe of the deadly Boston Marathon bombings, which took a new frightening turn yesterday when officials revealed the accused terrorist brothers made “spontaneous” plans to launch an attack on Times Square.

“I hear a lot of definitive statements out there that it was just these two men and it’s over, but I will tell you I hear these briefings every day, and I don’t think this is over,” said U.S. Rep. Mike Rogers, a Michigan Republican who chairs the House Committee on Intelligence. “There are clearly more persons of interest, and they’re not 100 percent sure if there aren’t other explosives.”

Rogers also blasted officials for Mirandizing Dzhokhar Tsarnaev, 19, saying he could have given more information about the potential attack on Times Square by him and his brother, Tamerlan Tsarnaev — and whether others were involved in the marathon attack.