Syrian antiquities scholar Khaled Asaad is reported to have been beheaded by Islamic State militants in the ancient city of Palmyra.
US officials believe the Islamic State group used mustard gas in an attack on Kurdish forces in Iraq this week, according to reports.
Sir John Chilcot, who heads the much-delayed inquiry into the 2003 Iraq war, has consistently turned down extra help to speed up proceedings, says the cabinet secretary.
At least 100 people are killed by a suicide bomb blast in a town just 20 miles from Iraq's capital Baghdad. The Islamic State group has claimed responsibility for the attack.
A deal on Iran's nuclear programme would be a historic event - but it could come at the expense of angering some of the US's staunchest allies.
Seeing our camera and tripod, tourists around St Paul's and Aldgate constantly approach to ask what is going on. No need for any inquiries a decade ago as the streets fell empty.
Kurdish fighters reportedly advance to within 30 miles of the Islamic State group's stronghold of Raqqa, while pro-Assad forces battle Sunni militants on the Lebanese border.