More than 80 people have died in northeastern Colombia as peace talks with the National Liberation Army failed, a Colombian official said.

Norte Santander Governor William Villamizal said that 20 people had been injured and that many of the killings occurred in Norte Santander.

The victims included community leader Carmelo Guerrero and seven people seeking to sign the peace agreement, according to a report released late Saturday by a government watchdog.

Officials said the attacks took place in several towns in the Catatumbo region near the Venezuelan border and at least three people taking part in peace talks were kidnapped.

Thousands of people are fleeing the area, some hiding in nearby dense mountains or seeking help in government shelters.

Colombian troops rescued dozens of people on Sunday, including a family and their pet dog whose owner placed a pack of cold water on the animal's chest to keep it cool as they were evacuated by helicopter.

Defense Minister Iván Velasquez traveled to the northeastern town of Cúcuta on Sunday, where officials prepared to deliver 10 tons of food and hygiene supplies to some 5,000 people in the communities of Ocaña and Tibu, most of whom fled violent situation.

"Catatombo needs help," Villamiza said in a public address on Saturday. "Boys, girls, young men, teenagers, whole families showed up, nothing, on trucks, dump trucks, motorcycles, doing whatever they could, on foot, to avoid becoming victims of this confrontation."

The attack came after Colombia suspended peace talks with the National Liberation Army (ELN) on Friday, the second time it has done so in less than a year.

The Colombian government demanded that the ELN cease all attacks and allow authorities access to the area and provide humanitarian aid.

The ELN has been clashing in Catatumbo with former members of the Revolutionary Armed Forces of Colombia (FARC), a guerrilla group that disbanded after signing a peace deal with the Colombian government in 2016. The two countries are vying for control of a strategic border region that hosts coca leaf plantations.

The ELN said in a statement on Saturday that it had warned former FARC members that if they "continue to attack the population... there will be no way out but armed confrontation". The ELN accuses former FARC rebels of numerous killings in the region, including the Jan. 15 killing of a couple and their 9-month-old baby.

Army commander Gen. Luis Emilio Cardoso Santamaria said on Saturday that authorities were reinforcing the humanitarian corridor between Tibou and Cucuta to allow safe passage for people forced to flee their homes. He said special urban forces were also being deployed to city capitals where "there are risks and a lot of fear".

The ELN has tried five times to negotiate a peace deal with President Gustavo Petro's government, but talks have failed due to outbreaks of violence. The ELN's demands include treating it as a political rebel group, which critics say is risky.