Brendan Vaughan, the British man thought to have been killed in Nigeria by an Islamic extremist group, was "likely to have been murdered in cold blood", the Foreign Secretary said.
William Hague added that the UK had "worked closely" with Nigeria over the last few weeks, and expressed his thanks to the Nigerian authorities.
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The outspoken Birmingham MP tweeted a picture of locksmiths ramping up security at her home after facing fresh intimidation on social media.
Islamic State's Amaq news agency released footage showing French attacker Abdel-Malik Nabir Petitjean urging Muslims to destroy the country.
Brighter skies developing across northern Britain and Northern Ireland with some sunshine tomorrow but feeling cooler again.