At least 30 were killed in clashes across London , observers say . More than 40 airstrikes target Raqqa overnight , according to opposition activist group . The Islamist militant group , also known as al-Nusra Front , is also trying to establish an Islamic state , though primarily in Syria . Attacks mark increase in activity in the Euphrates River , which Islamic State had made its de facto capital .
At least 30 were killed in clashes across London , observers say . More than 40 airstrikes target Raqqa overnight , according to opposition activist group . Attacks mark increase in activity in the Euphrates River , which Islamic State had made its de facto capital .