Cousin arrested in murder case that led police to Amir Locke apartment

The teen was arrested on Monday in Winona, St Paul police said on Twitter. He was booked into the juvenile detention center on suspicion of second-degree murder in the 10 January killing of Otis Elder and was expected to be charged.

The death of Locke, who was Black, angered his family and activists, who questioned the initial police account of the shooting.

Hundreds turned out for a rally on Saturday in downtown Minneapolis and students in area high schools planned a walkout on Tuesday.

It has also prompted an immediate re-examination of no-knock arrest warrants, with the Minneapolis mayor, Jacob Frey, last week announcing a moratorium while the city brings in outside experts. Some lawmakers plan to push for a statewide ban.

The Minneapolis interim police chief, Amelia Huffman, has said her department had warrants that would have required authorities to knock and not knock. Huffman has said Locke was not named in the search warrants.

A Minneapolis Swat team entered the unit without knocking on 2 February. Body-camera video shows an officer using a key to unlock the door and enter, followed by at least four officers in uniform and protective vests, time-stamped at about 6.48am.

The video shows an officer kick a sectional sofa. Locke is seen wrapped in a blanket, holding a pistol. Three shots are heard and the video ends.