After two days of fighting forced government troops to withdraw into Algeria, Northern Malian rebels seized the strategic border town of Tinzawatene, according to rebel and government officials.

The fighting in the remote northeastern town comes as aid agencies said some 50,000 Malians have been forced from their homes in three weeks of desert clashes by a rebel force bolstered by Malians returning from Libya's conflict.

The seizure of Tinzawatene by the Tuareg-led MNLA rebels, who say they are fighting to create an independent state in Mali's desert north, is a significant gain as it gives them control of a key transit and smuggling point in the desert.

‘Strategic retreat’
"It is true, the army has withdrawn from the (Tinzawatene) camp and pulled back onto the Algerian side of the border, but it was a strategic retreat," said a Malian defence ministry source, asking not to be named.

Hama Ag Sid'Ahmed, a spokesman for the rebels, said that the town's two military camps were under their control and several armoured vehicles and other military vehicles had been seized.

One rebel had been killed and another injured in the fighting, Ag Sid'Ahmed said.

The MNLA rebels have pushed south on three fronts since fighting erupted in mid January.

Refugee crisis
The International Committee for the Red Cross said on Wednesday that the number of Malians displaced within the country had risen to 30,000. Another 15,000 have crossed into Niger, it said.

Mauritanian aid officials have said at least 5,000 Malians have crossed westwards over the shared border.

Before the rebellion started, northern Mali was already awash with smugglers and home to a small but powerful group of fighters linked to al-Qaeda.