Minnesota's attorney general signalled on Sunday that additional charges could be lodged after a police officer was allegedly involved in the death earlier this month of a black man -- who was seen in video crying for help as an officer appeared to set his knee on the man's neck after he was accused of paying with a fake $20 bill. 

"At this point there is the two charges of third-degree murder and second-degree manslaughter," said Minnesota's attorney general Keith Ellison on NBC News' "Meet the Press" Sunday. "That complaint could well be amended to include other additional charges or even higher charges. And the other individuals are not out of the woods. The investigation is ongoing."

While Ellison said it would be speculative to announce what additional charges could come, he said that "certainly aiding and abetting is a possibility. And there are others as well."

Hennepin County Attorney Mike Freeman would be the one to actually bring forward the charges, added Ellison.

Late last week, the now former Minneapolis police officer, Derek Chauvin, 44, of Oakdale, was charged with murder and manslaughter in the death of George Floyd.

Following Floyd's death that was caught on video, protests stormed throughout cities around the country. Minneapolis saw five straight days of demonstrations that had included riots and destruction. 

But during the fifth night of protest on Saturday, there were no injuries or big fires, according to the StarTribune newspaper, as the city was under curfew for the second night Saturday night.

Many people stayed home, according to the paper, but the city saw some "scattered reports" of small fires and property damage.

According to the complaint against Chauvin filed by Hennepin County's attorney, police on May 25 struggled to get Floyd into the back of a cruiser after he was suspected of paying for items with counterfeit money earlier. 

Chauvin then just before 8:20 p.m. put Floyd on the ground face down, according to the complaint.

"The defendant pulled Mr. Floyd out of the passenger side of the squad car at 8:19:38 p.m. and Mr. Floyd went to the ground face down and still handcuffed."

Another officer held Floyd’s back and another held his legs. 

"The defendant placed his left knee in the area of Mr. Floyd’s head and neck. Mr. Floyd said, 'I can’t breathe' multiple times and repeatedly said, 'Mama' and 'please,' as well. The defendant and the other two officers stayed in their positions."

The victim begged for help, but the officers wouldn't budge and said, “You are talking fine,” according the the complaint. 

But around 8:24, reads the complaint, "Mr. Floyd stopped moving." 

Soon after he appeared to stop breathing and showed no pulse. 

Chauvin still refused to remove his knee from Floyd until several minutes later, according to the complaint.

Parts of this story have been clarified from an early version.