Jan 7 (Reuters) - Following are security developments in Pakistan at 0830 GMT on Wednesday.

* Denotes new or updated developments

HANGU - Militants killed three policemen and abducted three others in an attack on a security post in the northwestern town of Hangu early on Wednesday, senior police official Sajjad Khan said.

Authorities imposed a curfew in the town as minority Shi'ite Muslims prepared to observe Ashura, the ritual period of mourning marking the anniversary of the death of the Prophet Mohammad's grandson. Sectarian violence is common in Hangu.

* MIRANSHAH - Militants killed two Afghans accused of spying for U.S. forces in Afghanistan and dumped their bodies by a road in Mir Ali town in the North Waziristan region on the Afghan border, a security official and residents said.

* MOHMAND - Four people, including a woman and two children, were wounded when a mortar bomb fired by security forces in response to a militant attack on a checkpoint, fell on their house in the Mohmand region on the Afghan border, residents and a government official said. (Compiled by Islamabad bureau; Editing by Robert Birsel and David Fox)

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