Imran Khan said he is "shocked and deeply saddened" by the killing of Pakistani politician Zahra Shahid Hussain:
I am shocked & deeply saddened by the brutal killing of Zara Shahid Hussain, Zara apa to us, in Karachi tonite. A targetted act of terror!
Police said Ms Hussain was shot dead outside her home in Karachi, Pakistan's Dawn newspaper reported.
She was the senior vice-president of Khan's Movement for Justice party.
More top news
A 15-year study of almost 150,000 people found those taking the cholesterol-lowering drugs were more likely to survive the illness.
An Australian man has been airlifted to hospital after he was tossed in the air by an agitated bison at the famous national park.
Simon Cowell says he "felt like a bit of an idiot" after learning the Britain's Got Talent winner used a stunt double dog during the final.