The search continues for a missing teenage swimmer at Coney Island Beach.

Police say the 15-year-old boy was swept out to sea Thursday afternoon with another teen and only one of them has been rescued.

Authorities say they still have not found the 15-year-old boy and will their search efforts throughout Friday. They add that there are a lot of things that can impact the search, such as the tide and weather conditions.

Chopper 12 was in the skies on Thursday as the search for the 15-year-old began. Watch the birds-eye view of the start of the rescue mission below:

The NYPD had a boat in the water and a chopper in the air as early as 7 a.m. Multiple boats are in the ocean now focused on the shoreline where the swimmer went missing.

Witnesses tell News 12 they noticed the two swimmers in the water and even warned them the water was rough. Moments later, they were swept out and some New Yorkers got in the water trying to help as lifeguards were alerted.

A 16-year-old boy was pulled from the water alive, but the other swimmer was not found. The Parks Department says red flags were flying, meaning the boys were in a no swimming zone.

Divers and several agencies searched for the teen by boat and by air.

One beachgoer who jumped into action recounted the terrifying moments.

"I heard screaming and screaming. The mother, the aunt, everybody. Then I run with another guy. When I ran by the rocks it was deep. I started swimming with another guy and pulled out the tall skinny kid," says witness Fernando Agurto.

Others are shocked to learn the 15-year-old boy was still missing going into the weekend. The tragedy now has residents questioning if more life guards are needed, even when red flags are flying.

Brooklyn Council Member Ari Kagan tweeted that the victim's family is staying at a Bronx shelter and police are assisting them.