Venezuelan authorities have freed a prominent opposition activist jailed for four years just days after an anti-government politician died in state custody.

News of Lorent Saleh's release late Friday came as a shock to his supporters, and even his mother, who rushed to a Caracas jail expecting to receive her son only to learn he had been taken to the airport to board a flight for Spain escorted by government officials from the European country.

"I didn't know anything about this. I thought he'd be turned over here, but what's important is that he's free," a weeping Yamile Saleh told journalists outside the jail.

"He tried to calm me, saying he is with people he trusts," she said after speaking to her son by telephone. "We have to take care of Lorent's life. There are things I can't answer."

A government truth commission said Saleh was at risk of causing harm to himself after being evaluated for suicidal tendencies while imprisoned. It said it was decided he should be released as part of efforts to ease political tensions in the South American nation.

Saleh's mother had mounted an international campaign to secure her son's release.

Saleh, 30, was arrested in Colombia in 2014 and extradited by then Colombian President Juan Manuel Santos after appearing on a video phone call leaked by Venezuelan authorities bragging to an unknown person about plans to hire sharpshooters to sow unrest in Venezuela.

Santos, a future Nobel Peace Prize winner, was at the time seeking to curry favor with Venezuelan President Nicolas Maduro, who was sponsoring peace talks between Santos' government and leftist rebels

Further fueling the Venezuelan government's narrative that Saleh was plotting terrorist acts with international support, he was also photographed alongside prominent right-wing politicians such as former Colombian President Alvaro Uribe.

His extradition was widely condemned by human rights groups, who argued he could never get a fair trial in Venezuela and would be subjected to harsh conditions of confinement.

In 2017, he was one of several anti-government activists the opposition considers political prisoners awarded the Sakharov Prize for Freedom of Thought by the European parliament.

His release capped a tumultuous week that saw another anti-government activist, Caracas area councilman Fernando Alban, fall from the 10th floor of a police building where he was being held.

Authorities have called Alban's death a suicide, but opposition leaders have alleged — so far without evidence — that he was murdered while in custody. Several foreign governments and the United Nations have called for an independent investigation to determine whether foul play was involved.

Alban was arrested last week at Caracas' international airport upon arriving from a trip to the U.N. General Assembly in New York to press foreign officials to apply more pressure on Maduro's government. The government said he was being investigated for his alleged involvement in an August attack on Maduro with explosives-laden drones.