The England and Wales Cricket Board said it has received an apology from Kevin Pietersen and an admission that he did send "provocative" text messages to members of the South African team.
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Gunshots and explosions have been reported at Istanbul's Ataturk Airport.
Police say they are keeping an open mind about the motive and appealed for anyone with information to come forward.
Rain will clear east through this evening to leave a drier night for most, however showers will continue across some northern areas.