Emergency services were in inundated by calls from people in Oxford and Swindon who heard a loud bang this evening. The Ministry of Defence has confirmed it was a sonic boom from a Typhoon aircraft.
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A section of the M3 has been closed and bomb disposal units are at the scene after reports of "potential hazardous material in the road".
Largely dry with cloud and some sunny spells this afternoon with light winds.
Dry with sunny spells and light winds.