Five female Pakistani polio vaccination workers have been shot dead in a string of coordinated attacks – four within 20 minutes across Karachi.
The fifth woman was killed in Peshawar. A male health worker was shot dead in Karachi on Monday.
A UN-backed programme to eradicate polio – which is endemic in Pakistan – has been suspended in Karachi.
No group has said it carried out the shootings, but the Taliban have issued threats against the polio drive.
“These were pre-planned and coordinated attacks in various localities which took place within a span of 20 minutes,” Imran Javed, a police spokesman told the BBC of Tuesday’s attacks in Karachi.