Paris-based MEK denies involvement, says top official making accusation is spreading 'rage, rancor and lies' after assassination of Mohsen Fakhrizadeh

In rare letter, Foreign Ministry head tells diplomats to maintain 'highest level of vigilance' as officials worry Tehran may retaliate over assassination of nuclear scientist

State TV says weapon found at scene of Fakhrizadeh killing bore 'logo and specifications of the Israeli military industry'; senior official confirms attack was carried out remotely

Brazen daytime raid may hobble Biden's plans to rejoin the nuclear deal and draw retaliation from Tehran as it smarts from losing the architect of its atomic weapons program

Hatami says 'the enemy made a mistake' with assassination and nuclear program will continue; ceremony attended by Revolutionary Guards, Quds Force chiefs

London based Iranian journalist claims intelligence handing out photos of 4 men suspected of involvement in assassination as state media says clues found to identity of attackers

Abu Dhabi calls for restraint 'to avoid dragging the region to new levels of instability'; Israel reportedly concerned Tehran could retaliate against Israeli tourists in Emirates

Semi-official Fars claims operation to kill Mohsen Fakhrizadeh was conducted in three minutes with no human operatives on the ground

Security officials reportedly concerned that Israeli tourists could be targeted in terror attack in Gulf, in response to killing of top nuclear scientist

Reported precaution follows assassination of top Iran nuclear scientist; Israeli official praises hit, says 'the world is a safer place' without Mohsen Fakhrizadeh