German police searched nationwide Sunday for a 22-year-old Syrian man believed to have been preparing a bombing attack, who slipped through their fingers as they were closing in on him, and were questioning a second Syrian man on suspicion he was involved in the plot.

The man in custody was one of three apprehended in the eastern city of Chemnitz on Saturday. He was the renter of the apartment that police raided in their search for the main suspect, Jaber Albakr from the Damascus area of Syria, Saxony police spokesman Tom Bernhardt told The Associated Press. The other two men have been released.

He said the man in custody was Albakr’s “countryman” but would not give other details.

“We believe he is a possible co-conspirator,” Bernhardt said.