KABUL (Reuters) - A rocket hit the diplomatic district of the Afghan capital Kabul on Friday, close to most Western embassies, the presidential palace and the United Nations' main office, a police spokesman said. Abdulghafar Sayedzada, head of Kabul's criminial investigation unit, was unable to comment on casualties and could only confirm the rocket landed in the Wazir Akbar Khan area which is also home to many well-off Afghans and foreign companies. "The rocket hit one of the buildings which belongs to the Afghan Joint Operations Centre, it's not clear if there have been any casualties," said another police source who declined to be named. Afghanistan is hosting two high-level Western diplomats this weekend, US special representative for Afghanistan and Pakistan, Richard Holbrooke, and British Foreign Secretary David Miliband. There are regular rocket attacks on the city, which normally cause few or no casualties and limited damage.