April 20 (UPI) — A gunman opened fire Monday at Mexico’s iconic Teotihuacan archaeological site just outside Mexico City, killing a Canadian tourist and wounding more than a dozen others, including six Americans, authorities and officials said.

National Guard officers and personnel from the Security Secretariat of the State of Mexico responded to reports of shots fired and found two people dead and several others wounded, the agency said in a statement.

The law enforcement agency identified the second deceased as “the probable attacker.” The Security Cabinet of the Government of Mexico said in a separate statement that the shooter died by apparent suicide.

Six people were initially reported as wounded, four from gunfire and two from falls, but the number of injured rose to 13 by Monday evening.

According to a statement from the Security Cabinet, the victims ranged in age from 6 years old to 61 years old. Seven people suffered gunshot wounds, including a second Canadian, a 29-year-old woman taken to a hospital with a neck wound. Also wounded were a 29-year-old American man shot in the hand and a 61-year-old American woman shot in the left thigh who was reported to have a possible internal injury.

Among the injured were one Canadian, one Russian, two Brazilians, three Colombians and six Americans.

The injured were taken to hospitals for treatment, it said.

The identities of the deceased have not been made public.

“What happened today in Teotihuacan deeply pains us,” President Claudia Sheinbaum of Mexico said on social media.

“I express my most sincere solidarity with the affected individuals and their families. We are in contact with the Canadian embassy.”

Foreign Affairs Minister Anita Anand of Canada offered her condolences for the dead Canadian and support for the wounded online.

“My thoughts are with their family and loved ones, and Global Affairs consular officials are in touch to provide assistance,” she said.

The motive for the shooting remained under investigation.

Authorities said a firearm, a bladed weapon and live ammunition rounds were found by officers at the scene.