The president of the Zimbabwe Congress of Trade Unions, Peter Mutasa, “has presented himself to Harare Central Police Station accompanied by his lawyer,” a grouping of human rights lawyers said in a tweet.

It was not immediately clear whether he had been arrested, but his colleague, the ZCTU unions Secretary General Japhet Moyo was arrested on Monday as he flew into the country on charges of trying to subvert the government and inciting violence.

Mutasa appeared earlier this month on a video clip posted on social media, with cleric and activist Evan Mawarire.

They called jointly for a national job boycott to protest against a steep fuel price increase and the general economic meltdown.

Mawarire was arrested last week on subversion charges and earlier on Friday he sought bail in the High Court.

The prosecution opposed his bail application on the grounds that he was likely to abscond.

“If convicted he’s likely to stand a long term of imprisonment and that is enough inducement for him to flee,” prosecutor Mirirai Shumba told the High Court in Harare.

Nationwide demonstrations erupted last week after President Emmerson Mnangagwa announced that fuel prices were being doubled in a country suffering regular shortages of fuel, food and medicine.

Furious demonstrators took to the streets in several cities and towns with widespread rioting and looting.

Soldiers and police put down the protests and at least 12 people died. More than 1,100 were arrested, including opposition Movement for Democratic Change lawmakers and senior figures.