The police believe that the recovered weapons belong to the terrorists, who Monday night tried to attack Kemari oil field.
Three men wearing women's burqa tried to enter the oil terminal in the city but were resisted by a security guard.
They shot dead the guard and fled when a police patrol team engaged them in a firefight, according to police.
Police seized 10 grenades, three Kalashnikovs and women's purses crammed with bullets and cartridges.
The attackers, according to the police, planned to blow up the Kemari oil field, which is being used for fuel supplies to NATO forces fighting in Afghanistan.