Two Chinese nationals were wounded on Tuesday by a private security guard who opened fire at a garment factory in Pakistan's commercial hub Karachi, the latest in a string of attacks that have spurred Beijing to pressure Islamabad to improve security for its citizens, Paralel.Az reports citing Reuters.

Large contingents of police were deployed at the site of the factory in Karachi's industrial area, and forensic teams could be seen entering the premises, which were cordoned off.

There was no immediate claim of responsibility.

Police official Faizan Ali told Reuters the Chinese nationals had been shot at, but gave no further details.

One police official told Reuters on condition of anonymity that the shooting had been carried out by a security guard. The guard had not yet been arrested and it was difficult to ascertain the motive for the shooting, the official said.

Pakistan's foreign office said the shooting occurred following a dispute with the private guard, adding that the incident was under investigation.