The M4 was closed between junctions 1 and 3
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A 15-year-old boy died and two teenagers were seriously injured when a minibus careered off a motorway and crashed on Friday.
Police said the minibus was carrying eight passengers aged between 13 and 15 from an east London youth centre.
The vehicle left the M4 carriageway near Heston services and went up an embankment before falling on its side.
The driver, believed to be in his late 20s, and all passengers were taken to west London hospitals as a precaution.
It is thought the teenagers were going to a residential centre in Bournemouth when the bus crashed at 2000 BST on Friday.
The M4 westbound was closed to traffic between Junctions 1 and 3 after the accident.