Foreign Secretary Philip Hammond has told ITV News British agencies are "urgently investigating" a video that appears to show a British jihadist killing a US journalist.
He said the first step is to authenticate the video and then to establish the identity of the "murderer".
ITV News joined a Kurdish unit fighting Islamist militants near Irbil and found them using tanks from the 1950s and short on ammunition.Read the full story ›
Foreign Secretary Philip Hammond has said that the UK is taking a lead in preparing an EU resolution that will condemn ISIL, seek to freeze asset flows and take steps against individual terrorist and their facilitators.
He said EU member states were committed to "pushing back against the threat from ISIL - a threat to civilization, a threat to the region and a threat to us here in Europe."
Foreign Secretary Philip Hammond will chair a meeting of the COBR emergency committee this afternoon, Downing Street has announced.
The Foreign Secretary will chair a COBR meeting this afternoon on the situation in Iraq.
The Foreign Secretary dodged a question on US air strikes in Iraq as he arrived at Downing Street for a meeting of the Cobra emergency committee.
As a journalist called out, "Do you support the air strikes?" Philip Hammond responded, "Morning".
The Cobra meeting, which is chaired by Mr Hammond, is under way.
The quick breakdown of the ceasefire in Gaza is "extremely depressing," according to Foreign Secretary Philip Hammond, but he said that ending suffering remained the top priority.
He said: "Diplomacy is never dead. We have always got to keep trying but it is obviously extremely depressing that this ceasefire that we've all worked so hard to get broke down so quickly."
Britain wants to impose sanctions on Russian President Vladimir Putin's "cronies" in response to the country's response over the MH17 air disaster, Philip Hammond said.
The new Foreign Secretary said: "The cronies of Mr Putin and his clique in the Kremlin are the people who have to bear the pressure.
"If the financial interests of the group around the leadership are affected, the leadership will know about it."
He added: "We are looking at individuals who contribute to, in one way or another, the regime in the Kremlin and its interference in Ukraine and Crimea or who have benefited from the decisions and actions of that regime."
The European Union will impose new sanctions on Russia over the country's role in the MH17 airplane crash, the Foreign Secretary said.
Philip Hammond said the sanctions were placed on Russia as "strong condemnation" for its role in the aftermath of the disaster which left 298 people dead.
He said: "We've agreed on concrete proposals to draw up lists of additional people subject to sanctions and to do so in the next couple of days.
"[We are also] looking at broader ranging sanctions, including arms embargoes, access to capital markets, financial services and hi-tech goods including for the energy sector".
He added that Britain wanted "cronies" around Russian President Vladimir Putin to bear the pressure of the fresh sanctions.
New Foreign Secretary Philip Hammond has insisted he will not be "threatening" other EU states as the UK seeks to renegotiate its position in the bloc.
Mr Hammond is seen as a more eurosceptic voice than his predecessor, William Hague.
"I'm going to focus on making sure that we have a successful renegotiation with our European partners," he said.
"I don't think the way to enter a negotiation is to start issuing threats."
Defence Secretary Philip Hammond is to embark on a tour of Gulf states in a show of British support in the face of Isis's advances in Iraq.
Mr Hammond will meet ministers from of Saudi Arabia, the United Arab Emirates, Kuwait and Qatar during his two-day visit to the region starting tomorrow.
"The UK is deeply concerned by the recent developments in Iraq and the gains made by Isis.
"Although the UK is not planning a military intervention, we are committed to finding a long-term political solution," Mr Hammond said.
"We remain committed to the security of the Gulf, and want to reassure our friends and allies that we will do everything possible to support those who are working for a stable and democratic Iraqi state and to alleviate humanitarian suffering."