The cause of death of two Hamilton teens who were found near the Jolley Cut this weekend is still unknown.

Toxicology screening is being conducted but it will take a couple of months to get results, said Dr. Jack Stanborough, Hamilton's regional coroner.

"The manner of death is what we'll conclude once we know the cause of death," he said.

The two Saltfleet District High School students were found around 6:20 a.m. on Saturday. They were the third and fourth student deaths at the school this semester.

The Special Investigations Unit (SIU) is investigating the incident. But spokesperson Monica Hudon would not confirm whether the deaths were accidental.

Investigators are conducting witness interviews and examining evidence, she told CBC News on Monday afternoon.

Neither police nor the SIU would give the Grade 11 students' names, but friends interviewed near Saltfleet District High School said they were Alex McCormack and Irn Mace.

Their deaths cast a long shadow over the school. Using social media, students encouraged each other to wear black T-shirts in memory of the teens.

"It's not normal at school today," said Robert Kucemba, a Grade 10 student, told CBC News.

Grade 10 student Brittany Vanderlaan described it as "very quiet today. Depressing."

Students also reacted on Twitter this morning.

"I'm legitimately speechless," one wrote. "Worst year ever for Saltfleet."

"I can't take this anymore," another tweeted. "Too many people too soon."

Students getting help

Social workers are on site this week to counsel staff and students at a school that has seen an unusual number of student deaths, said Jackie Penman, spokesperson for the Hamilton-Wentworth District School Board.

"To lose four students (in one semester) is highly unusual."

Earlier this semester, a female student died of an illness and another female student took her own life, Penman said. The school has a population of 1,240 students.

Counsellors are helping students with "coping strategies" to deal with the loss, Penman said.

"Any time there's a loss, social workers will respond to ensure students have the support they need," she said.

"They'll see if there are any kids showing signs of anxiety, or sometimes they just need an adult to talk to."

Black shirts in memory

More than 100 students wore black shirts, and staff set up memorial tables in the hallway for students to leave written condolences, board superintendent Manny Figueiredo said.

Exams start on Wednesday. Some students who were close to the teens may have their exam schedules adjusted as they deal with their grief, Figueiredo said.

"These students were respected and loved and had their group of friends."

An off-duty police officer who had just finished his shift saw the youths around 5:30 a.m. on Saturday at the Jolley Cut, a winding road that cuts through the escarpment and connects the downtown to central Hamilton above the escarpment. He warned them that the area was not safe and contacted police communications after they walked away.

At 6:26 a.m., police received a call that two youths were "very seriously injured" near the roadway of the Clairmont Access beneath the Jolley Cut overpass, Hamilton Police Service say. They died soon after. It appears they went off the roadway at one of the highest points.

When contacted by phone, a family member of one of the youths who died on the weekend said the family doesn't want to talk to media.

"Thank you for respecting the privacy of the family," she said.