He said that some Islamic groups were behind the protests and turmoil, attempting to establish an "Islamic Emirate."
He said that Libya is different from Tunisia or Egypt. Any separation will make the country fall back to the situation 60 or 70 years ago. The clashes may cause civil wars in Libya.
Seif al-Islam said 84 protestors were killed in Benghazi, denying early reports of 250 deaths of protestors.
He said that protestors attacked the road-blocks in Benghazi because they were angry. The army and the police were not prepared to battle people. Dozens of protestors were arrested, including some campaigners.
Some protestors in Benghazi have reportedly seized tanks and heavy equipments and worsened the turmoil in the country. Al- Alabiya said a section of troops in the city joined the protestors.
"What's happening in Libya is very dangerous," he said. "How will Libya feed its people if the country falls apart?"
Seif al-Islam said the country is composed of tribes and clans, and oil is the only source that keep the Libyans united.
He also denied the use of mercenaries, saying the reports about this were not true.
Protestors began to go on streets in Libya on Wednesday, calling for an end to Muammar Gaddafi's 42-year-old rule, in an apparent attempt to emulate recent protests in neighboring Tunisia and Egypt, which forced the leaders of both countries to quit.
Internet services were partially cut off in Libya on early Saturday, reported AL-Jazeera.
Libyan envoy to the Arab League resigned on Sunday and joined the protests in his country, Egypt's state-run MENA agency reported.
A total of 100 protesters have been killed in the Libyan city of Benghazi by the security forces on anti-government protests, the pan-Arab Al Arabiya TV reported on Sunday.