The Minneapolis Police Department took a 23-year-old white man into custody around 11:20 a.m. in nearby Bloomington, Minnesota, according to a news release. The news release did not identify the man, stating that his name would be released upon charging. Police later tweeted that they arrested a 32-year-old Hispanic man at 12:05 p.m. in Minneapolis.
Police were still looking for an unspecified number of additional suspects, according to the tweet. Previously, police said they were looking for three white male suspects.
While local Black Lives Matter organizers said the group of men who opened fire on protesters were white supremacists, a spokesman for the Minneapolis Police Department told NBC News that it was "way too early" in the investigation to make any determination of motive.
The Minneapolis Star-Tribune reported that authorities on Tuesday were weighing whether to treat the shooting as a hate crime, citing anonymous sources familiar with the investigation.
This post has been updated.