Algerian civil society groups warned Saturday of toughening police tactics and reaffirmed their commitment to peaceful pro-democracy rallies, a day after officers in riot gear clashed with protesters.

Friday’s initially calm protest in central Algiers deteriorated into the worst street violence seen so far since marches began in mid-February demanding an end to the 20-year-rule of president Abdelaziz Bouteflika, who finally resigned on April 2, and his regime.

Police used tear gas and water cannon and scuffled with demonstrators, who in turn hurled stones and bottles, set light to at least one police car and turned large dumpsters into barricades.

Injuries were reported on both sides, and activists raised fears that the standoff has entered a new phase.

“Friday’s mobilisation was different because of the scale of the repression,” according to Said Salhi, vice president of the Algerian League for the Defence of Human Rights.

It said several activists were arrested on Saturday as they prepared to return to the key protest site at the capital’s main post office, condemning the action as “harassment”.

Demonstrators have vowed to push on with rallies against the interim government of Abdelkader Bensalah and its planned July 4 elections, arguing that leaders who emerged from the Bouteflika “system” cannot guarantee free and fair polls.

Salhi noted that the mood was different Friday outside the post office that has become an emblematic protest site.

“It usually starts joyfully at the post office, but there was a desire on the part of the authorities to clear the area,” he said.

Salhi said a turning point had come three days earlier when police had for the first time tried to disperse a student demonstration in Algiers with tear gas and water cannon.

Political scientist Cherif Driss said that, while the demonstrations have continued unabated, “the police are trying to refocus, and are beginning to reduce the public space for expression”.

Driss added however that “the response remains moderate and professional, with mostly water cannons and tear gas. There is no brutal repression.”

– ‘Delinquents and troublemakers’ –

Police put Friday’s violence down to “delinquents” infiltrating the crowds, and said 108 people had been arrested, while some protesters also blamed “troublemakers” for the clashes.

Driss said it was too early to tell whether Friday’s clashes were the result of “a strategy to limit demonstrations or a reaction to groups infiltrating” the protests.

The General Directorate of National Security reported that 83 police had suffered injuries. It denied having resorted to repressive tactics and said it was merely maintaining public order.

Several protesters were also injured, and at least one was hit in the chest by what appeared to be a rubber bullet, said an AFP photographer.

Activist groups stressed their commitment to non-violence, although some shops and properties were damaged after protests in the early days of the movement.

“The protesters are very committed to the continuation of the movement in its peaceful form,” said Abdelwahab Ferfaoui of civic group the Youth Action Rally (RAJ-Algeria). “It’s the key to success.”

At Friday’s clashes, AFP journalists saw some demonstrators placing themselves between rioters and police, raising their hands and chanting “silmiya” (peaceful) until the situation calmed.

“People did not respond despite the repression, we saw citizens defending police officers,” said Salhi.

“But we want to move towards a political solution quickly to avoid desperation. Letting the situation deteriorate until the elections in three months is not a solution.”