Three pilots and two cabin crew members of the Pakistan International Airlines (PIA) have been suspected of having coronavirus after they returned from a Toronto flight, reported 24NewsHD TV channel, on Sunday.

The crew members have been shifted to a hospital in Lahore where their tests would be conducted and if found positive they would be transferred to a quarantine centre.

Separately, four PIA pilots tested negative for coronavirus in Karachi on Sunday. They returned from a Britain flight.

PIA partially restored its flights' operation with special flights to Britain. Several flights had already left Islamabad for the UK and more are planned to take off in the next few days.