Correction: An alert for this story misstated the child's age
An infant is believed to be safe after police said they were investigating a possible kidnapping from Boston's South Station.
Just before 8:30 p.m., the MBTA Transit Police said they were looking for a 1-month-old boy and a red Chevrolet Suburban.
At 9 p.m., police said the vehicle had been stopped in Medford, and that the child was being evaluated "but appears unharmed." A man was taken into custody.
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Police later said that a male relative had been accused of forcefully taking the child from his mother.
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The man, whose name was not released, is due to be arraigned Thursday morning, transit police said.