The Shin Bet is reportedly investigating the entry of explosives to the mosque.
A St Petersburg website said the explosion took place at a cafe that had at one time belonged to Yevgeny Prigozhin, founder of the Wagner private army that is fighting for Russia in Ukraine.
Explosives left over from the 1950-1953 Korean War have long been a danger to citizens in both Koreas.
Transportation Security Administration officials located a suspicious item inside the suitcase that appeared to be a live explosive device.
The 17-year-old boy reportedly entered the minefield intentionally and may be suicidal.
The plot was thwarted after a foreign citizen noticed the drone carrying the explosive in Jaffa.
The land in Israel's Golan Heights now cleared of landmines from the Yom Kippur War will be used to produce green energy.