A young child holds a sign during the rally to protest the Trump administration's immigration policies Saturday, June 30, 2018, in New York, New York. (AP Photo/Kevin Hagen)

DETROIT (AP) — Hundreds of people gathered in Detroit and nearly two dozen other Michigan cities to add their voices to nationwide protests over the detention of immigrant families.

Detroit police estimated that more than 250 people marched Saturday through the city’s downtown before holding a rally at Hart Plaza in sweltering, 95-degree heat.

The Detroit News reports that Democratic U.S. Rep. Sander Levin told the gathering that the detention of young immigrant children and the Trump administration’s other immigration policies “are a danger to American society.”

Saturday’s rally was among hundreds across the U.S. urging the Trump administration to reunite families separated at the U.S.-Mexico border.

Rallies were also held in 22 other Michigan cities, including Jackson, where protesters gathered across the street from Republican U.S. Rep. Tim Walberg’s office.