A British MP is in a critical condition after reportedly being shot and stabbed in her constituency in northern England.
Media reports say opposition Labour MP Jo Cox was attacked as she prepared to hold an advice surgery for constituents in Birstall near Leeds.
A man has also been stabbed.
A 52-year-old man has been arrested by police.
BBC radio reports Cox, a 41-year-old mother of two, has been taken by air ambulance to a nearby hospital after being found bleeding on a footpath.
A West Yorkshire Police spokesman said: "Police were called to a report of an incident on Market Street, Birstall, where a woman in her 40s had suffered serious injuries and is in a critical condition.
"A man in his late 40s to early 50s nearby also suffered slight injuries.
"Armed officers attended and a 52-year-old man was arrested in the area. There are no further details at present.
"Police presence in the area has been increased as a reassurance to the community."
British MPs, who are currently not in parliament ahead of next week's referendum on whether Britain should remain in the European Union, have reacted with horror on social media.
Prime Minister David Cameron said: "Very concerned about reports Jo Cox has been injured. Our thoughts and prayers are with Jo and her family."
Neighbouring MP Yvette Cooper said: "Terrible, terrible news. Thoughts and prayers with good friend Jo and with her family."
Labour's Chuka Umunna said: "Utterly awful news about an attack on a superb and wonderful colleague @Jo_Cox1 - hoping and praying for her and her family right now."
Conservative MP Sir Eric Pickles said he was "very shocked" and he is praying for her recovery.
Tory Stuart Andrew said: "Horrified to hear the reports about Jo Cox. She's a lovely colleague and someone I respect enormously. My prayers and thoughts for all."
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