The president of the National Assembly of Venezuela, opposition leader Omar Barboza, said Sunday that the assembly will open an independent investigation into the death of Councilor Fernando Alban, who, according to the Office of the Prosecutor, committed suicide by jumping from the tenth floor of a law enforcement facility where he was detained.

"We will open an independent investigation of the national government to establish the truth behind this unfortunate event, where the councilor of the Libertador Municipality Fernando Alban was killed," Barboza said in a statement.

Barboza lamented the death of Alban, who had been arrested on Friday for his alleged involvement in a drone attack on the president, Nicolas Maduro in August, and said that the government "must answer for the lives of those in its custody."

He also said that on Tuesday the parliament will treat the councilor's case "as the only point on the agenda."

According to the statements of the Attorney General, Tarek Saab, Alban requested to go to the bathroom and there he jumped off the building to the ground.

Minutes later, Interior Minister Nestor Reverol said on Twitter that Alban was "in the waiting room" inside the headquarters of the Bolivarian National Intelligence Service in Plaza Venezuela, Caracas, and "jumped through a window of the facilities falling to the ground."

He added that "a multidisciplinary team" will investigate "jointly with the Public Ministry to clarify this unfortunate event."

However, Alban's party, the Justice First (PJ), said the politician was "killed by the regime of Nicolas Maduro" and demanded "the truth" behind his death.

Two-time presidential candidate Henrique Capriles, a PJ activist, also said on Twitter that those who knew the councilor know "that he could NEVER have acted against his life".

Different opposition leaders have highlighted that Alban was a devoted Christian and therefore it was "impossible" for him to commit suicide.

Alban was a councilor in the Caracas municipality of Libertador, considered a stronghold of all public authorities and considered territory supporting the ruling Chavismo.