An 11-month-old boy who became unresponsive during a car ride from Vienna to Reston on Wednesday died late Thursday night, Vienna Police said.

The incident is now being investigated as a suspicious death case.

The boy's caregiver put him into a car on Lakewood Drive in Vienna on Wednesday and drove him to meet his mother in Reston. When he arrived, they found him unresponsive. 

Fairfax County EMS brought the child to Reston Hospital Center, where he was treated before being flown to Children’s National Medical Center in Washington, D.C.

The boy died there at 11:50 p.m. Thursday.

Vienna Officer Bill Murray said Vienna detectives are interviewing several people involved in the incident. He said it's not clear where the child resided.

Patch will update this article as more information becomes available.