The Lebanese army says its troops have detained a Syrian gunman on suspicion he was part of an armed group that attacked a bus in a volatile northern city and wounded six men.

An army statement posted Sunday on Lebanon's official news service says troops detained a Syrian they suspect was behind the attack in a predominantly Sunni neighborhood of Tripoli the day before. The six wounded men came from a predominantly Alawite neighborhood.

Tripoli has witnessed intense clashes between Lebanon's factions that support opposing sides in Syria's conflict. Saturday's attack raised fears that of more than two years of fighting between Sunni Muslim rebels and supporters of President Bashar Assad, who is Alawite, would re-ignite Lebanon's own explosive sectarian mix.

Lebanon's 15-year civil war ended in 1990.