Back in Europe, the manhunt continued for Belgian-born Salah Abdeslam, a key suspect in the Paris attacks that killed 130 people, while Brussels entered a fourth day of lockdown amid fears of an “imminent” attack.
French police said they were analysing a suspected suicide belt similar to those used in the Paris attacks, found without its detonator in a dustbin in the Montrouge suburb of the capital.
Telephone data placed Abdeslam in the area on the night of November 13.
Brussels will stay on its highest level of alert at least until next Monday, with Belgian Prime Minister Charles Michel warning that the threat “remains serious and imminent”, though schools and the Metro will reopen Wednesday.
The security measures include the patrols citywide of armed soldiers and police, something a counter-terrorism expert says has not seen in at least two decades.
Belgian authorities have charged a fourth person in connection with the bloodshed in Paris, which was claimed by the Islamic State group.
A new complication hit the delicate diplomacy around the conflict in Syria after Russia confirmed one of its fighter jets had been shot down by Turkey at the Syrian border.
“Presumably as a result of firing, an Su-24 plane of the Russian forces crashed in the Syrian Arab Republic,” Russian news agencies quoted the defence ministry as saying.
Turkish reports said two pilots had ejected and one captured by Syrian rebels.
– Shuttle diplomacy –
Washington and Paris have stepped up their fight against IS, with France launching its first strikes from an aircraft carrier in the Mediterranean and the United States calling for more international cooperation against the jihadist group.
Underlining heightened global fears of attacks after Islamists killed scores in Mali, Turkey, Lebanon and Nigeria in recent weeks, the US government issued a worldwide travel alert warning American citizens of “increased terrorist threats”.
“Current information suggests that ISIL (another acronym for Islamic State), Al-Qaeda, Boko Haram and other terrorist groups continue to plan terrorist attacks in multiple regions,” said a State Department travel advisory.
Hollande’s trip to Washington is part of a frantic week of shuttle diplomacy by the French leader as he tries to rally global support for increased strikes against IS.