By Ariba Shahid KARACHI, Pakistan (Reuters) -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.

Authorities say a Pakistani guard shot and wounded two Chinese nationals working in a textile mill in the southern port city of Karachi, but the attack was not related to militant violence.