The Iranian security forces fired six mortars across the border in Mashkhail district of Pakistan's southwestern Balochistan province on Friday, officials said.
    
A security official said the Pakistani forces retaliated the fire, forcing the other side to stop the shelling.
    
He said that Iranians mortars fell about 3,000 meters deep in Pakistan.
    
Ties between the two countries were soured after last week's brief clash on the border in which a Pakistan soldier was killed and three others injured.
    
Iran said that its two personnel also died in clashes.
    
Chief of Pakistan's paramilitary Frontier Corps has threatened to respond to any future firing incidents.

He also visited Tehran after last week's clashes and the two sides agreed to improve intelligence sharing to avoid such incidents.

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