Sudan's state-run radio says security troops fired tear gas overnight to disperse dozens of protesters who attacked a group of policemen in the capital Khartoum.

Saturday's report by Omdurman Radio says about 150 protesters were involved and that one police vehicle was damaged.

The Sudanese opposition said earlier Friday that riot police cracked down on anti-regime protesters after prayers in several Khartoum districts.

It was the sixth day of protests set off by a government austerity plan that slashed subsidies and doubled the price of fuel and food. The protesters are inspired by Arab uprisings in neighboring Egypt and Libya and are demanding the ouster of longtime Sudanese President Omar al-Bashir.

The opposition says hundreds of protesters were rounded up over the week but were released soon afterward.