HERAT, Afghanistan, Sept 6 (Reuters) - A suicide bomber blew himself up in the offices of an Afghan provincial attorney on Saturday killing him, his son and a clerk, the provincial government said.

The attack took place in Nimroz, which adjoins the Taliban stronghold of Helmand.

"The suicide bomber managed to enter the compound in Nimroz city and detonated himself killing the attorney and two other people," governor Ghulam Dastagir Azaad said.

Violence has surged in Afghanistan this year as the hardline Islamist Taliban have stepped up their campaign of guerrilla attacks backed by suicide and roadside bombs to oust the pro-Western Afghan government and drive out foreign troops.

Azaad said Saturday's suicide attack was the 13th in Nimroz province in the past six months. (Reporting by Sharafuddin Sharafiyaar; Editing by Sanjeev Miglani)

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