CARACAS (Reuters) - Venezuela’s top court accused four opposition lawmakers of treason on Tuesday, following similar accusations against 10 legislators this month, escalating a deep political crisis in the South American country.

Venezuelan National Police members stand in line near the National Assembly building in Caracas, Venezuela, May 14, 2019. REUTERS/Ivan Alvarado

Security forces earlier prevented lawmakers from entering the legislature for Tuesday’s session, saying they were investigating the possible presence of an explosive device inside the building.

The Supreme Court accused lawmakers Carlos Paparoni, Miguel Pizarro, Franco Casella and Winston Flores of treason and inciting rebellion.

The accusations, in a statement posted on the court’s Facebook page, marked the latest step in a crackdown by President Nicolas Maduro on allies of opposition leader JuanGuaido following a failed effort to spur a military uprising inApril.

“This simply gives us more strength,” Flores told Reuters, calling the Supreme Court’s accusations “illegitimate orders from the dictator.”

“We know they will continue with this process of trying to destroy the National Assembly,” he said.

Mexico’s foreign ministry said later on Tuesday it had received opposition lawmaker Franco Manuel Casella Lovaton in its embassy in Caracas “to provide protection and shelter.”

The ministry, which stressed its commitment to protecting human rights, also said it would continue to follow a policy of non-intervention in Venezuela.

“The government reaffirms its position of non-intervention, its openness to dialogue and its firm commitment to collaborate in finding a democratic, peaceful and collaborative solution to the situation that Venezuela faces,” it said in a statement.

One opposition lawmaker was arrested and several took refuge in foreign embassies in Caracas or fled the country last week after similar accusations from the court.

‘ILLEGAL SENTENCE’

Flores said he would make an “emergency” trip to Uruguay to denounce the wave of accusations against Venezuelan lawmakers to the parliament of the Mercosur trade bloc, where he is also a representative, in Montevideo.

Pizarro called the court ruling “an illegal sentence that seeks only to generate fear to shut us up” in a post on Twitter.

Reuters was unable to obtain comment from the other legislators.

Opposition leaders have in recent weeks called such charges an effort by the ruling Socialist Party to shut the legislature. The Trump administration strongly condemned this month’s detention of Edgar Zambrano, the vice president of the legislature.

Guaido, leader of the opposition-controlled assembly, invoked Venezuela’s constitution in January to assume an interim presidency, arguing Maduro’s 2018 re-election was illegitimate. More than 50 countries have recognized him as the country’s rightful leader and say the assembly is its last remaining democratic institution.

“This is a dictatorship that goes after dissidents, and we are fighting for a political change,” lawmaker Juan Pablo Guanipa told Reuters, referring to the blocking of congress.

Tuesday’s session was scheduled for 10 a.m. (1400 GMT) but never began. The lawmakers were set to discuss the charges against their colleagues and the arrest of Zambrano, an outspoken critic of Maduro.

Venezuela’s information ministry, which handles media inquiries on behalf of the government, did not respond to a request for comment on why security forces blocked the entrance to parliament. Maduro, a socialist, calls Guaido a puppet of the United States seeking to oust him in a coup.

The government stripped the assembly of most of its powers after the opposition won a majority in 2015 elections. Lawmakers loyal to Maduro generally do not attend the sessions but go to meetings of the Constituent Assembly, a legislative body created in 2017 that meets in the same building.

The Constituent Assembly is controlled by the ruling Socialist Party and its powers supersede those of the National Assembly.

Opposition lawmaker Jorge Millan told reporters the report of “bombs” in the building was false.

“It is a trick to prevent the parliament from functioning today,” he said. “If we do not have a session today, we will do it tomorrow.”