NEW DELHI -- Canadian Prime Minister Justin Trudeau admitted Thursday that a convicted Sikh extremist had been invited to dine with him in New Delhi, just the latest controversy to dog his visit to India.

Trudeau said the invitation to Jaspal Atwal -- who was found guilty of trying to assassinate an Indian minister in 1986 -- had been revoked and those at fault had taken responsibility.

"Obviously, we take this situation extremely seriously," he told reporters in New Delhi.

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"The individual in question never should have received an invitation and as soon as we found out we rescinded the invitation immediately."

Trudeau has been at pains during his visit to quash long-simmering perceptions in India that his administration is soft on Sikh extremists.

India's Prime Minister Narendra Modi attends a meeting with Saudi King Salman in Riyadh, Saudi Arabia April 3, 2016. REUTERS

This latest scandal emerges on the eve of his meeting with Prime Minister Narendra Modi, who has been notably absent during Trudeau's week-long trip throughout India with his family.

Atwal was convicted for a botched assassination attempt on an Indian cabinet minister in Canada in 1986 and was sentenced to 20 years by a Canadian court.

He reportedly attended an event in Mumbai on Tuesday, where he was photographed alongside Trudeau's wife Sophie Gregoire, according to Canada's public broadcaster CBC.

The Canadian High Commission would not comment on whether Atwal was part of Trudeau's official delegation, although reports in Canada said Trudeau's office had denied this.

"We do not comment on matters relating to the PM's security," the high commission said.

Trudeau, who is accompanied by several Sikh members of his cabinet, said the "member of parliament who included this individual" had taken responsibility for their actions.

Atwal was a member of the International Sikh Youth Federation, an organisation outlawed in India and Canada, among other places, that seeks an independent Sikh state of Khalistan.

India's foreign ministry said it was investigating how Atwal -- a Canadian passport holder of Indian origin -- managed to obtain a visa to travel to India.

Speaking to the Reuters news agency, foreign ministry spokesman Raveesh Kumar appeared to indicated that Trudeau's apology had been accepted.

"The fact that an invitation which was already extended to Mr. Atwal has been withdrawn, it basically shows that they have taken into account the concerns which we have, and I think we just need to move on from there now. I think it was an oversight," Kumar said.

Canada is home to roughly half a million Sikhs and Trudeau's administration has been accused of being too cosy with those agitating for a separate homeland in India's northern Punjab state.

Trudeau particularly riled New Delhi last year when he attended a parade in Canada at which Sikh militants were feted as heroes.

Tensions over the Khalistan issue have marred Trudeau's visit, and fuelled speculation the prime minister was being snubbed by Modi.

The Indian leader often meets heads of government at the airport with bear hugs and cheerful photo-ops, but a junior minister was rolled out to meet Trudeau and his family on Saturday evening.

Government officials greeted the Trudeaus at the Taj Mahal and in Modi's home state of Gujarat, where Israeli Prime Minister Benjamin Netanyahu was last month personally escorted by the Indian leader.

Trudeau on Wednesday visited the Golden Temple in Amritsar -- the holiest shrine in Sikhism -- before assuring Punjab's chief minister that Canada did not sympathise with extremist movements.

But photographs of Atwal flanked by Canadian officials at the Mumbai event attended by Trudeau have thrust the controversy back into the headlines.

Modi and Trudeau are scheduled to meet Friday in New Delhi at the tail end of his first visit as prime minister to India.