BAGHDAD - Iraqi forces are flooding into an industrial zone of Fallujah that was once a Sunni insurgent stronghold.

The raids began early today in a district of factories and workshops in the southern part of the city, about 65 kilometres west of Baghdad.

Fallujah's police chief, Col. Mahmoud al-Issawi, claims armed groups are trying to re-establish footholds in the area more than two years after being driven out.

The police action comes two days after a suicide bomber struck an Iraqi military base in Habbaniyah near Fallujah.

The blast injured at least 38 Iraqi soldiers -- and was the fourth major attack against Iraqi security forces this month.

Fallujah's industrial area was formerly a hub for insurgent bomb-making and rocket production.