SOFIA, Bulgaria (AP) — A bus carrying tourists back to North Macedonia crashed and caught fire in western Bulgaria early yesterday, killing at least 45 people including a dozen children, authorities said.

The bus apparently ripped through a guard rail on a highway, though authorities said the cause was still under investigation. Photos taken shortly after the crash showed the vehicle engulfed in flames as plumes of thick, black smoke rose. Daylight revealed a burned-out shell with all of its windows blown out, sitting in the median. A portion of the guard rail was peeled away and lying in the road.

Seven survivors were taken to hospitals after the crash, which happened as a group of buses was returning from a trip to Turkey. Twelve children were confirmed among the dead, according to the North Macedonia chief prosecutor, Ljubomir Joveski.

Bulgarian Interior Minister Boyko Rashkov told reporters at the crash site that he had “never in my life seen something more horrifying”.

“The people who were on the bus are turned to charcoal,” Rashkov said. “There were four buses that travelled together, and it is possible that passengers changed buses during the stops.”

Borislav Sarafov, chief of Bulgaria’s national investigation service, confirmed that 52 people were on the bus.

Among the survivors, five are North Macedonia citizens, one Serb and one Belgian, according to the North Macedonia foreign ministry.

Albanian Foreign Minister Olta Xhacka, meanwhile, wrote that almost all of the dead were ethnic Albanians but it was not clear if they were also citizens of North Macedonia, home to a significant number of ethnic Albanians.

News of the crash hit hard in the small country of two million people. The North Macedonia Government observed a minute of silence yesterday and declared three days of mourning. Flags will be lowered to half-staff and all public events will be cancelled. The country’s prime minister travelled to Bulgaria, as did its chief prosecutor who visited the crash site.

Azem Sadiki, mayor of Studenicani municipality near Skopje, the capital of North Macedonia, told reporters that 20 of the crash victims were residents of his community. He said the dead included a mother and her four children as well as the woman’s sister and her two children.

“We are very sad. This is a huge loss for us all, and the whole country,” Sadiki said.

The country’s prime minister, Zoran Zaev, who visited survivors in the hospital, told Bulgarian television channel bTV that one person said he was awoken by an explosion.

In Skopje, police and relatives gathered outside the offices of a travel company that is believed to have organised the trip. The office looked closed, with a grate pulled down over its door.

“Now we are waiting for bad news,” Bekim Aliti, who was visibly distraught, told reporters outside the building. He said his wife and his brother’s wife were on the trip.

Eldin Shiroki said his cousin works as a tour guide for the company. “We still don’t have any accurate information, so we are waiting,” he said.

In 2019 Bulgaria had the second-highest road fatality rate in the 27-nation European Union, with 89 people killed per million according to European Commission data.

“Let’s hope we learn lessons from this tragic incident and we can prevent such incidents in the future,” said Bulgarian caretaker Prime Minister Stefan Yanev.

European Commission President Ursula von der Leyen expressed her condolence to the families and friends of those who died and said “in these terrible times, Europe stands in solidarity with you”.

In response to the deadly crash, the Bulgarian Government declared today a national day of mourning for the bus victims. The occasion will also mark the deaths of nine people who died in a nursing home fire Monday in the eastern Bulgarian village of Royak.