A union leader of Pakistan's national airline says security forces opened fire on an anti-privatization rally in the port city of Karachi, killing two employees.

Suhail Baluch said police also used batons Tuesday to disperse the demonstration against government plans to privatize Pakistan International Airlines (PIA).

Police say they are still investigating the incident, and do not know who opened fire at the demonstration.

Dr. Seemi Jamali, a spokesman at Jinnah Hospital in Karachi, confirmed the two deaths.

A spokesman for PIA said steps are being taken to ensure that flights are not disrupted. The violence came a day after the PIA employees' union announced it would cancel flights in an attempt to pressure the government into abandoning its privatization plans.