Masked men broke onto the set of a public television channel in Ecuador waving guns and explosives during a live broadcast on Tuesday, and the president issued a decree declaring that the South American country had entered an “internal armed conflict”.

The men armed with pistols and what looked like sticks of dynamite entered the set of the TC Television network in the port city of Guayaquil during a news programme that was airing live in thousands of homes across the nation and shouted that they had bombs. Noises similar to gunshots could be heard in the background. It was not immediately clear if any station personnel were injured.

Alina Manrique, the head of news for TC Television, said she was in the control room, across from the studio, when the group of masked men burst into the building. One of the men pointed a gun at her head and told her to get on the floor, Manrique said.

The incident was aired live, although the station’s signal was cut off after about 15 minutes. Manrique said some of the assailants ran from the studio and tried to hide elsewhere in the building when they realised they were surrounded by police.

“I am still in shock” Manrique told Associated Press in a phone interview. “Everything has collapsed … All I know is that its time to leave this country and go very far away.”

Ecuador has been rocked by a series of attacks, including the abductions of several police officers, in the wake of a powerful gang leader’s apparent weekend escape from prison.

President Daniel Noboa on Monday declared a national state of emergency, a measure that lets authorities suspend people’s rights and mobilise the military in places like prisons.

Shortly after the gunmen stormed the television station, Noboa issued another decree designating 20 drug trafficking gangs operating in the country as terrorist groups and authorising Ecuador’s military to “neutralise” these groups within the bounds of international humanitarian law.

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Ecuador’s national police chief later announced that authorities had arrested all the masked intruders. Police commander Cesar Zapata told the television channel Teleamazonas that officers seized the guns and explosives the gunmen had with them. He said 13 people were arrested.

“This is an act that should be considered as a terrorist act,” Zapata said.

The government has not said how many attacks have taken place since authorities announced that Los Choneros gang leader Adolfo Macias, alias “Fito”, was discovered missing from his cell in a low security prison on Sunday. He was scheduled to be transferred to a maximum security facility that day.

Authorities also have not said who is thought to be behind the attacks, which included an explosion near the house of the president of the National Justice Court and the Monday night kidnappings of four police officers, or whether they think the actions were coordinated.

Police said one officer was abducted in the capital, Quito, and three in Quevedo city.

Los Choneros is one of the Ecuadorean gangs that authorities consider responsible for a spike in violence, much of tied to drug trafficking, that reached a new level last year with the assassination of presidential candidate Fernando Villavicencio. The gang has links with Mexico’s Sinaloa cartel, according to authorities.

The whereabouts of Macias are unknown. Prosecutors opened an investigation and charged two guards in connection with his alleged escape, but neither the police, the corrections system, nor the federal government confirmed whether the prisoner fled the facility or might be hiding in it.

In February 2013, he escaped from a maximum security facility but was recaptured weeks later.

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Noboa said in a message on Instagram that he would not stop until he “brings back peace to all Ecuadoreans”, and that his government had decided to confront crime. The wave of attacks began a few hours after Noboa’s announcement.

States of emergency were widely used by Noboa’s predecessor, Guillermo Lasso, as a way to confront the wave of violence that has affected the country.

Macias, who was convicted of drug trafficking, murder and organised crime, was serving a 34-year sentence in La Regional prison in the port of Guayaquil.

Experts and authorities have acknowledged that gang members practically rule from inside the prisons, and Macias was believed to have continued controlling his group from within the detention facility.