The UK has launched its first air strikes in Syria, hours after MPs overwhelmingly endorsed Prime Minister David Cameron's plan to bomb what he called the "medieval murderers" of Isis.
Four Tornado jets took off from the RAF's Akrotiri air base in Cyprus and struck targets in Syria early on Thursday morning.
Michael Fallon, UK defence secretary, told the BBC the strikes targeted oilfields and well heads in eastern Syria. The four Tornados left the base in pairs around 03.00 GMT, with two returning without their 500lb Paveway bombs.
Mr Fallon added that the RAF force in Cyprus would be doubled, with two extra Tornados and six Typhoon jets already on their way.
The US-led coalition, which has been carrying out strikes against Isis in Syria for months, has recently turned its attentions to oil infrastructure in territory controlled by the group.
Oil is one of the main revenue sources for Isis, or Daesh, as the UK government now refers to the group. Isis generates millions of dollars each week by selling oil on the black market to buyers within the country, including some of its military opponents, and overseas.