LOS ANGELES — The Latest on a incommunicative little boy found apparently abandoned in Los Angeles (all times local):

8:30 p.m.

Los Angeles police have arrested a woman they believe abandoned her young son at the main downtown train station.

Police took 31-year-old woman into custody Thursday afternoon when she returned to Union Station. She was later booked on suspicion of child endangerment.

The woman remains jailed on $100,000 bail and it wasn't clear whether she had an attorney.

Police say the 7-year-old boy was found wandering the station Wednesday evening. Authorities and workers say the boy and his mother were seen eating together at a cafe, but the woman walked away when confronted.

Police say she was detained when she returned some 19 hours later and the boy — who'd been unable to communicate with authorities — was reunited with other family members.

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3:35 p.m.

Police say the mother of a young boy who was abandoned at Los Angeles train station has been taken into custody and is being questioned by investigators.

Los Angeles police say the woman was taken into custody Thursday afternoon at Union Station, where the boy was found the night before.

Police believe the boy, between 5 and 7, may be deaf or autistic because they hadn't been able to communicate with him.

He was reunited with his family Thursday afternoon. Later in the day, his biological mother showed up at the train station.

Police said they are still investigating why the boy was left at the train station.

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1:35 p.m.

The Los Angeles Police Department says a possibly deaf or autistic little boy found at downtown's Union Station has been reunited with his family.

The department tweeted the development Thursday but said the investigation was continuing and did not disclose details.

The department thanked community members and news media for spreading word about the boy, who was left alone at the station on Wednesday. Police had said they could not communicate with the boy.

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7 a.m.

Police are trying to identify a little deaf boy found at Union Station in downtown Los Angeles.

Transit officers were alerted to the unattended child around 7 p.m. Wednesday and found that the boy is deaf and does not communicate.

A sign language interpreter tried to communicate with the boy but was unsuccessful.

The Police Department says the child is also possibly autistic.

He's described as black, 5 to 7 years old, 3 feet 5 inches (1.07 meters) tall and about 60 pounds, with brown eyes and long, braided hair.

He's dressed in a blue down jacket, white tank top shirt, beige pants and gray tennis shoes.