Persistent protests have been staged for weeks over the subsidy cuts, which have led to a sharp rise in the cost of other goods, including medicines.
Wednesday’s demonstrations came after the end of a three-day nationwide strike called by several opposition groups, which received a mixed response.
“No, no to high prices,” shouted about 300 men and women as they marched along a main street of Omdurman near Khartoum on Wednesday morning, an AFP correspondent reported.
Anti-riot police swiftly arrived at the scene and fired tear gas to disperse them, the reporter said.
In a separate demonstration in downtown Khartoum, about 150 lawyers protested in front of the high court — the first rally of its kind since the fuel price hike was announced earlier this month.
Dressed in black gowns and coats the group stood facing the high court and carried banners that said: “Say no to corruption, Say no to high prices, Say no to detentions.”
Several people in cars flashed victory signs in support of the lawyers as they drove by, the AFP correspondent reported.
The lawyers later dispersed as anti-riot police arrived and began confiscating their banners.
Sudanese authorities have cracked down on protests in an attempt to prevent a repeat of the deadly unrest that followed a previous round of subsidy cuts in 2013.
Dozens of people were killed at that time when security forces crushed large street demonstrations, drawing international condemnation.
Authorities have already arrested more than a dozen opposition politicians in recent weeks, and also cracked down on newspapers critical of subsidy cuts.
Members of the powerful National Intelligence and Security Service (NISS) have seized entire print runs of several dailies that reported the opposition strike call or questioned the cuts.
Authorities have also halted broadcasts by Omdurman Channel, a private television channel, accusing it of operating without a licence, a charge its owner denied.
To protest the crackdown on newspapers, a group of journalists staged a small demonstration in central Khartoum on Wednesday afternoon.
Wearing badges that said “Journalists on strike,” the group expressed concern on the media crackdown.
“The authorities are harassing us and restricting our freedom of speech,” said one journalist, a member of the Sudanese Journalists’ Network, an unofficial group that advocates free speech.
© 1994-2016 Agence France-Presse
The "Underwear Bomber" failed to detonate his explosive underwear because the attacker Umar Abdulmutallab wore the explosive undies for two weeks straight thereby making the bomb's fuse damp.