Toronto: A memorial for the victims of the Air-India tragedy, inscribed with the names of all the 331 people who lost their lives in the bombing, was unveiled here today as Canada observed the 22nd anniversary of the bombing.

Opening the memorial -- featuring a sundial, gardens and a granite wall, Prime Minister Stephen Harper said his government is serious about the threat of terrorism, as evidenced by its decision to launch a probe into the tragedy. "We must act to ensure such an atrocity is never again visited upon our fellow citizens," Harper said on the sun-drenched shore of Lake Ontario.

The memorial is inscribed with the names of the 329 people who were aboard the Flight 182 when it blew up off the coast of Ireland on June 23, 1985, and the names of the two baggage handlers who were killed in a related explosion at the Narita airport in Tokyo the same day.

"The sundial is supported by a wall that is made in part from stones from all of the provinces and territories in Canada. There are also stones there from India, US, Ireland and Japan. All of these countries were directly affected by the tragedy," Peter Klambauer, who co-coordinated the project for the city of Toronto, said.

Families of the victims said the memorial gives them a tangible place to grieve the loved ones they lost. About two-thirds of the Air India bombing victims live in Toronto.

Susheel Gupta, who is now a federal Crown prosecutor in Ottawa but was just 12 when his mother Ramwati Gupta died on the Kanishka flight, said the memorial has been a long time coming.