The Red Line experienced severe delays this evening due to multiple disabled trains, authorities said.

A tweet from the MBTA announced moderate delays at 5:18 p.m., which were later raised to severe delays half an hour later. The alert was canceled and regular operations resumed at around 7 p.m.

According to MBTA deputy press secretary Kelly Smith, there had been an earlier disabled train at the Charles/MGH station this afternoon. Coupled with two additional disabled trains later on, the Red Line was left backed up for hours, said Smith.

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The causes of the train breakdowns are unclear at this time, said Smith, as the cars are being brought in for inspection.