A small explosion has damaged the front of the Egyptian consulate in the eastern Libyan city of Benghazi, witnesses have told Reuters.
There were no immediate reports of injuries.
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Marjorie and Michael Cawdery, both 83, are understood to have been stabbed to death in a killing their family called "incomprehensible".
Detectives have launched a murder investigation following the shooting in Brent, north west London on Friday night.
Hot and humid throughout the Bank Holiday Weekend.