Fared Obiad, a local police spokesman, says the bombing took place today in the provincial capital of Lashkar Gah. He says the bomber walked into a police compound but was stopped before entering a building where a security meeting was underway.
Obiad says he then detonated his explosives. The explosion killed one officer and wounded three others.
No group claimed responsibility but the Taliban have stepped up their attacks on Afghan security forces as foreign combat troops prepare to withdraw by the end of the year.