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US authorities have arrested an alleged member of a militia that has been stopping migrants trying to cross the US-Mexico border.

Larry Mitchell Hopkins, 69, was detained in New Mexico as a felon in possession of a weapon.

It comes just days after a video emerged of militia members detaining dozens of migrants in the desert.

The group, United Constitutional Patriots, has been condemned by civil rights groups and local officials.

said New Mexico Attorney General Hector Balderas.

"Today's arrest by the FBI indicates clearly that the rule of law should be in the hands of trained law enforcement officials, not armed vigilantes."

The alleged militia member appeared in court on Monday.

He is accused of being a convicted felon in possession of firearms, and now faces up to 10 years in prison, probation and $250,000 (£192,000) in fines, .

United Constitutional Patriots, a small volunteer group, argues it is helping US Border Patrol to deal with a surge in migrants crossing America's southern border. It is one of several militias operating in the region.

As details of this week's latest video emerged, New Mexico governor Michelle Lujan Grisham said on Twitter that

US Customs and Border Protection have previously said they are opposed to civilians patrolling the border in search of illegal crossers.