Update: Three arrested.

Shortly before 4:30 p.m. Stanley Forman photographed the area around the Soldiers and Sailors Monument taped off.

Around 4:30 p.m., Suffolk University alerted the few students still living at 150 Tremont St. "Report of shots fired in the Boston Common. If you are a resident of 150 Tremont St. Please shelter in place until further notice."

Live Boston reports a man was stabbed at Ashburton Place and Bowdoin Place but that police found him on the Common near the Park Street T station around 6:20 p.m. He was taken to a local hospital with injuries not considered life threatening.

Melissa reports that shortly after 3 p.m., a manhole in Cambridge Street between the Charles/MGH Red Line station and MGH itself exploded. Read more.

An exasperated citizen files a 311 complaint about rubber bands strewn all along West Cedar Street: Read more.

The Beacon Hill Times reports the Beacon Hill Architectural Commission has been identifying businesses putting free-standing signs on sidewalks and having a little chat with them to make them remove them.

That license plate on that car on Beacon Hill, parked in front of a handicap ramp. It was cold, so Ryan didn't stick around to see if the driver came back double-fisting iced coffees and wearing cargo shorts with a Sox cap on.

Louise Miller watched the family fireworks over Boston Common at 7 p.m.

A roving UHub photographer watched the sun go down over Storrow Drive, which was still blocked inbound as crews tried to clean up the mineral oil that spilled around 9:30 a.m., along with the transformers carried on a truck whose driver thought his rig would fit under a bridge near Charles Circle, only it didn't.

Ed Lyons reports:

During a truly epic traffic meltdown near MGH today, everything was gridlocked until some homeless guy put down his cup, walked into it, and started quite aggressively managing the traffic, unclogging the intersection. He succeeded. People were waving and thanking him.