Seattle Seahawks star Michael Bennett has claimed police threatened to shoot him last month in Las Vegas for "being a black man in the wrong place at the wrong time".

The Super Bowl-winning defensive end has claimed the incident occurred as he returned to his hotel after attending the Conor McGregor-Floyd Mayweather fight last month.

Las Vegas Metropolitan Police Department have confirmed they are investigating the incident, after Bennett posted a statement on Twitter.

Bennett, who won the NFL's biggest prize with Seattle in 2014, said he and others were running away from the sound of gunfire when he was stopped by officers.

"I ran away from the sound (of gunshots), looking for safety," said Bennett in his social media statement.

"Las Vegas police officers singled me out and pointed their guns at me for doing nothing more than simply being a black man in the wrong place at the wrong time.

"A police officer ordered me to get on the ground. As I lay on the ground he placed his gun near my head and warned me that if I moved he would 'blow my f****** head off'. A second officer came over and forcefully jammed his knee into my back, making it difficult for me to breathe."

The Las Vegas Metropolitan Police Department confirmed they were looking into the incident via social media.

"Reference a statement made by Michael Bennett, this case is under investigation. Reserve judgement. We will address this publicly today," the LVMPD tweeted.

A vocal critic of racial injustice, Bennett revealed his fears as he was detained by police.

"I felt helpless as I lay there," continued Bennett's statement. "All I could think of was 'I'm going to die for no other reason than I am black and my skin colour is somehow a threat'."

Bennett claimed to have been detained in the back of a police car before being released when officers recognised him as an NFL star, not "a thug, common criminal or ordinary black man".

Bennett has supported fellow NFL star and current free agent Colin Kaepernick after he refused to stand for the national anthem last season.

Kaepernick backed Bennett on social media, tweeting: "This violation that happened against my brother Michael Bennett is disgusting and unjust.

"I stand with Michael and I stand with the people."