France mourns, seeks clues to carnage

Syrian passport found next to body of man who bombed country's national stadium

Thousands of French troops deployed around Paris on Sunday and tourist sites stood shuttered in one of the most visited cities on Earth while investigators questioned the relatives of a suspected suicide bomber involved in the country's deadliest violence since World War II.

The Islamic State group claimed responsibility for Friday's attacks on a stadium, a concert hall and Paris cafes.