Suicide bombers reportedly killed dozens of people and injured over 100 in a busy market in the Iraqi capital.
Pakistan has reacted angrily after the Trump administration suspended aid and the US president accused Islamabad of lies and deceit over many years.
Queen Elizabeth II is using her annual Christmas message to pay tribute to the way the cities of London and Manchester pulled together after extremist attacks earlier this year.
The FBI says it has foiled a plot to launch an attack on a popular San Francisco tourist destination in the days before Christmas.
Salah Abdeslam, the sole surviving suspect in the 2015 Islamic State attacks in Paris was due to face justice on Monday over a shootout with Belgian police.