Two Canadian sisters who were seriously injured in the deadly attack on Kenya's Westgate shopping mall have returned to Toronto.

Fardosa Abdi, 17, and Dheeman Abdi, 16, landed in Toronto Sunday evening via air ambulance, after travelling through Dublin, Ireland. Their condition was not immediately known.

The sisters' aunt, Hodan Hassan, said the teens were shopping when gunmen from the Somalia-based militant group al-Shabaab stormed the Nairobi mall on Sept. 21.

Following the attack, Fardosa underwent at least two surgeries for leg injuries and Dheeman suffered a leg and arm injury caused by an explosion.

Upon landing at Toronto's Pearson airport the sisters were rushed to Sunnybrook Hospital, where Fardosa will receive further treatment for her injuries.

The sisters, who were born in Toronto, moved to Nairobi three years ago, Hassan said.

At least 67 people were killed in the attack at Westgate Mall, including Canadian diplomat Annemarie Desloges and Vancouver businessman Naguib Damji.

Meanwhile, hundreds of Kenyan Canadians gathered in Toronto Sunday where they mourned the victims of the Westgate Mall attack.

Ben Ondoro, president of Kenyan Community in Ontario, called for unity amongst Christians and Muslims during the gathering.

"We cannot allow terrorists to divide the Kenyan nation along religious lines," he told the crowd.

Hitesh Parmar told CTV Toronto that Kenyans remain "shaken" following the attack.

"I've lost a couple of friends as well and family,” he said. “It's just the mourning period and time will heal it now.”

With files from The Canadian Press and CTV Toronto's Scott Lightfoot