WASHINGTON (CBSDC/AP) — Canadian and United States authorities say they have thwarted a major terror attack plot that involved a passenger train.

Royal Canadian Mounted Police say the attack planned by Chiheb Esseghaier and Raed Jaser had been receiving support from Al Qaeda.

Authorities say Esseghaier and Jaser “had the capacity” to derail a train that would have resulted significant injuries. RCMP adds the plot was still in the planning stages and the public was not imminently in danger.

The two suspects had been under surveillance since 2012 and were arrested in Toronto and Montreal.

Esseghaier and Jaser are facing charges of conspiring to carry out an attack against, and conspiring to murder persons unknown for the benefit of, at the direction of, or in association with a terrorist group.

The pair had been living in Toronto.

There is no link between this alleged terror plot and the Boston Marathon bombings that killed three people and injured 180 others last week. Dzhokhar Tsarnaev, 19, was charged by federal prosecutors in his Boston hospital room Monday with using a weapon of mass destruction to kill — a crime that carries a possible death sentence.

The two suspects are expected to appear in court Tuesday.

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