Gunmen in the southern Pakistani port city of Karachi ambushed three vehicles carrying supplies for the NATO forces in neighbouring Afghanistan on Thursday, injuring three people, police said.

"Four unknown armed men riding on two motorcycles opened fire and hurled hand grenades on NATO supply trucks in Baldia neighbourhood and escaped," local police official Mohammad Ali told AFP.

"The attack wounded three people on the trucks and damaged the trucks. The trucks were bound for Afghanistan's Kandahar town."

NATO and US-led forces battling a worsening Taliban-led insurgency in landlocked Afghanistan are hugely dependent on Pakistan for supplies, with about 80 percent passing through the country.

The bulk of equipment required by foreign troops is shipped through northwest Pakistan's tribal region of Khyber, where Taliban militants have carried out a series of attacks on the convoys.

Supplies heading to forces fighting in the Afghan south — the Taliban heartland — also pass through Baluchistan province, which is plagued by Islamist, sectarian and separatist unrest.

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