There's one lane closed and heavy traffic due to an accident on the M4 eastbound at junction 20 (M5 Almondsbury Interchange).
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The man who carried out the Westminster attack is thought to be British born and was once investigated by MI5, the Prime Minister has said.
More than 50 primary school children from Somerset, who were caught up in the terror attack in Westminster, have returned home safely.
Police forces across the region have been paying tribute to an officer killed during the terror attack in Westminster.