Russia: Plane brought down by homemade explosive device

MOSCOW (AP) — A homemade explosive device brought down a Russian passenger plane over Egypt last month, the head of Russia's FSB security service said today, telling President Vladimir Putin it's now clear the crash that killed 224 people was a "terrorist" act and offering a $50 million reward for information leading to the arrest of those responsible.

The Islamic State group had already claimed responsibility for the attack, and Putin vowed to hunt down those who carried it out. Russian war planes struck Raqqa, the self-declared IS capital in Syria, and other targets today, the defense minister told Putin at a briefing later in the day.

The FSB appealed to the "Russian and international communities for cooperation in identifying the terrorists." It specified that the reward would be paid in dollars.

"According to our experts, a homemade explosive device equivalent to 1 kilogram of TNT went off onboard, which caused the plane to break up in the air, which explains why the fuselage was scattered over such a large territory. I can certainly say that this was a terrorist act," FSB head Alexander Bortnikov said.

He said tests showed the explosives had been produced outside of Russia, but gave no further details.