The latest on news from Russian officials that a passenger jet was brought down over Egypt by an explosive device. (All times local.)

1:55 p.m.

Russia's FSB security service has offered a $50 million reward for information leading to the arrest of those responsible for downing the passenger plane over Egypt.

FSB director Alexander Bortnikov announced Tuesday that a homemade explosive device had blown apart the aircraft and that it was now clear that it was a "terrorist" act.

The FSB later appealed to "Russian and international communities for cooperation in identifying the terrorists" and offered "50 million U.S. dollars" reward.