Moscow
The suspect is undergoing a psychiatric evaluation.
This is the first official Egyptian indication that the plane was deliberately downed.
It's unclear who's behind the poster, which a Moscow opposition figure labeled "disgusting."
They are accused of crimes during a 1991 crackdown on the country's independence movement.
WHAT'S HAPPENING
Another 23 people also injured in the blaze.
Wireless connection aims to attract more visitors to historic cemeteries.
Kremlin critic Pyotr Pavlensky's latest stunt is a fiery one.
Authorities say the group was planning an attack on Moscow's public transport system.