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
Two people are being treated in hospital after an "explosion" in a flat in West Dunbartonshire.
Tom Billings, 22, went missing in Canada in December 2013 during an eight-week trip of North America.
Minh Quang Pham was sentenced in a US court for three counts of terrorist-related activity.