Friday is Islam's main communal prayer day.
Leaders of the Muslim community say anyone who takes a life violates the basic principal of Islam.
"There are some seven million Muslims in America who are all peaceful, patriotic and support our troops so along with being deeply saddened and horrified by these events we are also concerned that people might call into question our patriotism and loyalty to this country," said Amina Sharif, Council On American Islamic Relations.
It has become standard procedure for Muslims to be told to be on alert after tragic incidents that involve someone of the Islamic faith like the Fort Hood shootings.
