European nations worked Monday to keep diplomatic efforts to curb the Israel-Iran war alive as the two countries traded strikes following the United States’ weekend attack on Iran’s nuclear program. Calls for Tehran to enter talks with Washington appeared to fall on deaf ears as it reached out to ally Russia for support.

Explosions boomed in Qatar on Monday night as witnesses said they saw what appeared to be missiles in the skies over the country. There was no immediate acknowledgment from Qatari authorities of any attack.