KABUL, Jan 14 (Reuters) - There was a large explosion at a luxury hotel in the Afghan capital Kabul on Monday, but there was no immediate word of any casualties, a police official said.

A Western security source said a suicide bomber approached the five-star Serena Hotel and was challenged by security guards and blew himself up. The hotel is mainly frequented by foreigners. (Writing by Jon Hemming; Editing by Jerry Norton)

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