Wheelchair-pushing man threatened security guard on Mission Hill with needle or small knife, police say

Boston Police have released photos of a man they say threatened to stab a security guard at 1520 Tremont St. with a small, sharp object around 4 a.m. on Friday.

He's described as white, 35-45, 6 feet tall with a medium build.

If he looks familiar, contact detectives at 617-343-4275 or the anonymous tip line by calling 800-494-TIPS or by texting TIP to CRIME (27463).