The sonic boom, created by two Typhoon jets from RAF Coningsby in Lincolnshire, has been described as "scary"
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The boy had been walking to the shops when the man grabbed him by the arm as he was crossing the road. The child struggled free and ran off.
The Polish international says he will create some "good stuff on the pitch" and is "not afraid to fight" after joining from FC Twente.
Rotherham United have sold last season's top scorer Danny Ward to Cardiff City for an undisclosed fee.