Methuen police detectives are seeking three suspects involved in a recent robbery of the TD Bank at 547 Broadway, near the Lawrence line. On the evening of Feb. 21, a man wearing a face mask entered the bank, showed a handgun to a teller, and left with an undetermined amount of money. He fled in a white car driven by another man; a third person was in the car as well. In late January, another TD Bank in Methuen, located at 228 Haverhill St., was robbed by a man who said he had a weapon but did not show one. Methuen police have posted photos of the most recent suspect on their Facebook page and on their blog, www.methuenpoliceblotter.blogspot.com.