Al Shaabab insurgents stepped up an offensive against Somalia's government last month and on Thursday killed the country's security minister and at least 30 other people in a suicide car bomb attack.

They also killed an MP in northern Mogadishu on Friday.

"Today the Somali cabinet has unanimously declared that the country is in a state of emergency," a cabinet statement said, according to Reuters.

Parliament speaker Sheikh Aden Mohamed Madobe had earlier asked neighbouring countries to step in militarily to rescue the struggling government.

Residents in the central areas of the Horn of Africa country reported on Saturday seeing Ethiopian troops in Somalia.

"We are asking the world and neighbouring countries to intervene in Somalia's situation immediately," Madobe told a parliament meeting convened as the opposition fighters advanced towards the presidential palace.

 "We want them to come here within 24 hours," he said.

"We've been forced to make this request because of the escalating violence. Those fighting the government are being led by a (former) Pakistani army general, they are burning the flag and killing people," Madobe said.

Kenya said on Friday it would not sit by and allow the situation in its neighbour to deteriorate further because it would destabilise the region.

Kenya and other countries in the region as well as Western nations fear that if the chaos continues in Somalia, groups with links to al Qaeda will become entrenched and threaten the stability of neighbouring countries.

Kenya said on Friday the African Union was committed to beefing up its 4,300-strong peacekeeping mission in Somalia and helping to build a police force.

But an al Shaabab spokesman warned it against any intervention.