NEW : Brazilian firefighters call off search for survivors . NEW : Death toll rises to nine in church roof collapse . Concrete slab collapsed during service at evangelical church , authorities say . It is one of largest congregations in Sao Paulo , Brazil .
NEW : Brazilian firefighters call off search for survivors . NEW : Death toll rises to nine in church roof collapse . Concrete roof fell during service at evangelical church , authorities say . Church hosts one of largest congregations in Sao Paulo , Brazil .