The firing on the post began Thursday evening when two BSF troopers were injured. The Indian side had retaliated after the first bullet hit the post.

'After last night's lull, there was firing again at the same post to which we have again retaliated,' the BSF official added.

He said the BSF was trying to ascertain the source of the firing. It was unclear whether the firing was from militants trying to sneak into India or from Pakistani Rangers, the border guards of that country.

'The preliminary assessment points more to militants trying to infiltrate to this side,' the official said, requesting anonymity.

He added that the BSF had carried out a check of the three-tiered barbed wire fence from a distance and 'there appears no breach, which scales down the possibility of the infiltration having succeeded. But there will be a closer look at the fence once we are sure that firing has stopped. If it was fire from Pakistani Rangers, then it can be termed as yet another ceasefire violation'.