Islamabad, Jan 2 (IANS) At least four people were injured Monday in a grenade attack in Pakistan’s Karachi city.

The attack took place around 1.00 p.m. when motorcycle-borne assailants hurled grenades at a mobile company’s office in the city’s Haideri Market, Xinhua reported.

The market was closed after the attack. Some of the injured were in critical condition, hospital sources said.