Convenient timing, wasn't it? It took a a couple of days to get the story up and running. First reports said the bomb was left on the bus when the bad guy exited, in a half hour found a suspect and quickly released him, then a gag order and then reports that the bomb was thrown through a window of the bus. Should figure out the logistics first, don't you think?
Man shot dead in northern Israel town of Bi'ina, police say the murder was gang related (Haaretz)
from the article: Israel arrests Hamas, Islamic Jihad cell behind Tel Aviv bus bomb