Egypt's military has carried out dawn bombings of Islamic State targets in Libya, according to reports by state television.
Seven days of mourning were declared in Egypt after Islamic State militants released a video claiming to show the murder of 21 Egyptian Christians kidnapped in Libya.
The video has been condemned by governments around the world, while the Egyptian leadership vowed to respond to the "criminal killings".
Libya's air force also participated in the air strikes on Libya, which targeted Derna, an eastern coastal city regarded as a base for fighters of the so-called Islamic State.
"There are losses among individuals, ammunition and the (Islamic State) communication centres," Libyan air force commander Saqer al-Joroushi told Egyptian state television, adding that dozens had been killed.
Joroushi, who is loyal to Libya's internationally recognised government, which set up camp in the city of Tobruk after losing control of the capital Tripoli, said there would be more strikes on Tuesday.
The Democratic presidential candidate may also have shown his cards on his choice of running mate.
The US president also shared a post on Twitter accusing Dr Anthony Fauci of misleading the public over hydroxychloroquine.
Fears over an impending second wave of coronavirus dominates Wednesday’s front pages.