The US and Canada have reached a deal to reject asylum seekers at unofficial border crossings, officials say.

Large numbers of migrants have been making unsanctioned crossings via Roxham Road at the US-Canada border.

The move closes a loophole created by a 2004 asylum agreement with the US on where migrants have to make their asylum claims.

It allowed Canada to turn migrants away at official points of entry but not at unofficial crossing points.

As part of the deal, Canada will now also create a new refugee programme for 15,000 migrants fleeing persecution and violence in South and Central America, unnamed US officials told CBS News, the BBC's US partner.

The new deal extends the asylum agreement along the entire 9,000km (6,000 mile) border and is to go into effect at midnight on Friday local time, Reuters reported.

President Biden is in Ottawa, Canada, for 24 hours to discuss a series of economic, trade and immigration issues with his Canadian counterpart, Justin Trudeau.

He is scheduled to address parliament on Friday before the leaders hold a joint news conference.

Security is heavy in Canada's national capital for the presidential working visit. Police cruisers and officers can be seen circling the area around parliament, and nearby streets have been closed to the public.

American flags are flying along Wellington, the street that runs in front of the parliament buildings.

The migration accord is scheduled to be formally announced before Mr Biden returns to the US on Friday evening.

The US side has also seen a rise in migrant crossings into Canada. The agreement is expected to allow officials on both sides of the border to turn back asylum seekers heading in either direction.

The move is part of efforts to limit an influx of migrants at Roxham Road, an unofficial crossing between New York state and the province of Quebec.

The deal is an amendment to the two sides' 2004 Safe Third Country Agreement (STCA), which requires migrants to make an asylum claim in the first "safe" country they reach, whether it is the US or Canada.

The STCA allows US and Canadian officials to turn away asylum claimants in both directions at formal ports of entry, but does not apply to unofficial crossings.

That led to many migrants trying to enter Canada at places where there is no official border crossing. The new arrangement would close that loophole.

The deal is "not going to stop people", Abdulla Daoud, executive director at The Refugee Centre in Montreal, told the BBC on Friday, adding he is concerned it could "incentivise human smuggling".

Speaking about the new refugee programme, he said: "The numbers are too low. We had 40,000 cross just in the past year - 15,000 is a low number and just from one part of the world, the western hemisphere."

New York City authorities last month said they were providing free bus tickets for migrants to travel up towards the US border with Canada.

Negotiations on the new US-Canada border deal had been stalled for months, according to reports. US officials reportedly did not want to rework the agreement, as the country was bogged down with its own migrant crisis at the US-Mexico border.

Mr Biden's administration has also proposed to crack down on asylum seekers at the US southern border with Mexico by making it harder for migrants to claim asylum once Covid border controls lift in May. The proposal has met backlash from human rights groups.

The new US-Canada agreement could take effect quickly as it does not require the approval of US Congress.

Mr Trudeau has argued the only way to halt irregular border crossings at Roxham Road is by renegotiating the Safe Third Country Agreement.

With additional reporting from Eloise Alana in Montreal