TORONTO — The Toronto imam who first brought forward concerns about one of the suspects in the alleged al-Qaeda-linked train plot wants to remain anonymous, his lawyer said Tuesday. Naseer Syed said the imam came to him more than a year ago about the suspect’s conduct. “It was enough of a concern and it passed a certain threshold than the imam felt comfortable with,” he said. The lawyer said he then notified the appropriate authorities. On Monday, the RCMP credited the imam’s tip with helping bring terrorism-related charges against Raed Jaser and Chiheb Esseghaier.