Libyan leader Muammar Gaddafi's son Seif al-Islam on Monday warned of civil war in the country if violence continued, as the wave of anti-government unrest continued to grip some countries in the Middle East and North Africa on Sunday following protests in Egypt and Tunisia that toppled their long-time presidents.

In Libya, anti-government protests spread to the capital of Tripoli on Sunday. Some protestors in Benghazi, the second largest city, have reportedly seized tanks and heavy weapons, further worsening the country's turmoil.

Dubai-based Al-Alabiya said a section of troops in the city joined the protestors.

Gaddafi's son Seif al-Islam early Monday went on state television to proclaim that his father remained in charge with the army's backing and would "fight until the last man, the last woman, the last bullet."

Seif al-Islam said Libya's parliament would convene on Monday to discuss a "clear" reform agenda, while the government would also raise wages.

"We will have to lay down a constitution for the country," he said, pledging to make reforms in future.

Al-Alabiya and Al-Jazeera TV channels reported earlier that Gaddafi has left for Brazil or Venezuela, and his son Seif al-Islam took over as the head of the country. But this was not confirmed by any Libyan official sources.