QUETTA, Pakistan, April 9 (Reuters) - Suspected separatist militants attacked a military vehicle in Pakistan's gas-rich Baluchistan province on Monday killing three soldiers and wounding two, a military spokesman said.

Militants seeking a greater share of profits from resources in Baluchistan, Pakistan's biggest but poorest province and its main source of natural gas, have been waging an insurgency for decades.

"They fired on a moving vehicle and three soldiers were killed," said military spokesman Major-General Waheed Arshad. Soldiers were hunting for the attackers, he said.

A man claiming to speak for the Baluchistan Liberation Army guerrilla group telephoned a press club in the provincial capital, Quetta, to claim responsibility for the attack in Sibi district, 160 km (100 miles) east of Quetta, a reporter said.

Baluch nationalists rebels frequently attack gas pipelines, electricity infrastructure and transport links in the province of deserts and barren mountains on the borders of Afghanistan and Iran.

They also attack security forces but they have no links with Islamist insurgents also fighting government forces along the Afghan border.

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