At least 10 people were hospitalized Monday after a Boston subway car derailed underground and another car braked quickly to avoid a collision, officials said.
Only one person had serious injuries, according to a statement from Boston Emergency Medical Services.
A Green Line Massachusetts Bay Transportation Authority train appeared to have come off its rails and crashed into a wall where a pair of tracks crossed underground, according to photos posted to emergency officials' Twitter accounts.
"Injuries were some people from derailed trolley and some from a 2nd trolley that hit brakes hard to avoid derailed trolley," the Boston Fire Department said in a tweet.
The cause of the incident was under investigation, and trains in the area were canceled for the rest of the day.
Boston EMS Incident Commander at MBTA train derailment updated report: 10 patients transported, 9 green and 1... http://t.co/bufIoj1sbN— Boston EMS (@BOSTON_EMS) March 10, 2014