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US derailment: 'Extensive damage', says Gov Malloy

Some 60 people have been injured, five critically, after a head-on, rush-hour collision between two commuter trains near New York City, officials say.

About 250 people were on the trains involved in Friday evening's crash. No fatalities have been reported.

Officials said a train that left New York City's Grand Central station en route to New Haven, Connecticut, derailed then was hit by another train.

Connecticut Governor Dannel Malloy said the front of one of the trains had been extensively damaged and its wheels were "sticking into the other train".

One of the five people with the most serious injuries was described as being in a "very critical" condition.

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