What the heck is going on?!

After 4 slayings, Menino rips cuts — 12 deadly hours leave city shaken

Tacary Jones, 17, of Dorchester was shot at point-blank range about 2:30 p.m. Friday on an MBTA bus at Columbia Road and Geneva Avenue in Dorchester, police said.

Luis Barros was killed in what witnesses described as a drive-by shooting shortly before 10 p.m. Friday on Longfellow Street in Dorchester, according to a law enforcement official briefed on the investigation.

Sergeant Richard Dever, 35, of Dorchester, a corrections officer for the Suffolk Sheriff's Department, was stabbed to death about two hours later outside a Charlestown tavern, police said.

Then, about 2:45 a.m. Saturday, Eddie Williams, 20, was shot to death while sitting in a car near his house on Forest Street in Roxbury, the law enforcement official said.

Boston's violent crime rate is still lower than most cities its size, but wow.