Actually the Govt. banned the site because of the 'obnoxious' carricature of country's prime minister and the leader of the opposition (both of them are female) posted by a citizen who has been arrested yesterday. The Govt. is exploiting the Muhammed issue as a pretext for ban as the cotnroversy of Muhammed started well before this funny carricature of country's leaders.
U.S., allies conduct 1 air strike in Syria and 11 in Iraq against ISIS militants (Reuters)
from the article: Bangladesh blocks Facebook over Mohammad caricatures