<sod >Mattis' visit comes just over a week after the worst-ever Islamic militant attack in Egypt's modern history took place in the troubled northern Sinai where over two dozen extremists descended on a mosque and mowed down more than 300 worshippers.< eod>< sod > Mattis' visit came just over a week after the worst-ever Islamic militant attack in Egypt's modern history took place in the troubled northern Sinai where over two dozen extremists descended on a mosque and killed more than 300 worshippers.< eod>