The U.S. is trying to get more countries to agree to join a coalition against the Islamic State, in Iraq and Syria.
Hundreds of Taliban fighters attacked a district close to the Afghan capital, Kabul, and reportedly beheaded 15 people
The airstrikes on 12 refineries near Al Hasakah, Al Mayadin and Abu Kamal were carried out late on Wednesday and early on Thursday.
The videos of the brutal beheadings of James Foley, Steven Sotloff and David Haines helped rally global opinion against the extremist Islamic State group.
This marks the second round of French airstrikes in Iraq since the country joined the U.S.-led coalition last Friday.
France has so far ruled out joining the U.S.-led airstrikes in Syria against the Islamic State group.
Anjem Choudary — a self-styled preacher and former head of banned Islamist group Islam4UK — is reportedly among the nine people arrested.
Mohammed Bashir, said to be an imposter who appeared in the group's videos, was killed in a Nigerian military offensive.
The British prime minister reportedly said that “past mistakes” should not be an “excuse for indifference or inaction” in the fight against ISIS.
The expansion of the designated terrorist list could mean more targets for airstrikes in Syria.
The U.S. military said it was targeting 12 of the Islamic State group's "modular" refineries, which generate around $2 million a day.
The second wave of airstrikes on ISIS militants in Syria targeted their oil revenues.
The resolution requires states to combat terrorism domestically and prevent their citizens from leaving to fight for foreign terrorist groups.
Muhsin Al-Fadhli was one of the few al Qaeda operatives with prior knowledge of 9/11. He was only 20 years old at the time.
Jund al-Khilafah's beheading video of Hervé Gourdel closely resembled beheadings carried out by ISIS.
"We just don't have a confirmation to make at this point," said Pentagon spokesman Colonel Steve Warren. "We don't have personnel on the ground to verify, so we're continuing to assess."
U.S. Secretary of State John Kerry suggested the Iraqi capital might have come under ISIS control if not for U.S. airstrikes.
"Islamic State continue to ignore our pleas to open dialogue,” Barbara Henning, wife of the British hostage, reportedly said.
One of the key leaders of to al-Nusra Front has been killed in airstrikes in Syria, the group said in a statement.
Monday's "unprecedented" joint effort reveals the anxiety that ISIS has caused in the Middle East for majority-Sunni countries.
U.S. Ambassador Samantha Power cited Article 51 of the U.N. Charter to justify the airstrikes.
Militants already had moved their families to suburban locations and reportedly only went out under cover of darkness.