Two Chinese nationals were shot at and injured on Tuesday in Pakistan's commercial hub of Karachi, police and hospital officials said, after a string of attacks that spurred Beijing to demand tougher 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.

Karachi: Two Chinese nationals were injured on Tuesday when a local security guard opened fire at them following a quarrel in Pakistan 's port city of Karachi, police said.Chinese Nationals ShotThe incident reportedly took place at a police station in the Industrial Trading Estate area of Karachi in Sindh province.