seaweed bloom florida
"I​t's just too dangerous to swim right now."

That was the warning Sunday from the Bay County Sheriff's Office in the Florida Panhandle after announcing double red flag warnings and closing the water to swimmers.

Over the span of two days, at least six people were killed in rip currents along Florida beaches.

Three of the deaths happened Friday evening, when a group of men from Alabama were caught in a rip current at Panama City Beach in Bay County.

The group went for a swim around 8 p.m., shortly after arriving and checking into a vacation rental, the Bay County Sheriff's Office said in an updated Facebook post Saturday evening.

"The three men were caught in a rip current shortly after entering the water," the post said.

All three went missing and a search effort was launched by the U.S. Coast Guard and others. The men were found separately and eventually pronounced dead at area hospitals, authorities said.

The sheriff's office identified the three as Birmingham, Alabama, residents Harold Denzel Hunter, 25, Jemonda Ray, 24, and Marius Richardson, 24. Earlier this week, single red flags had been posted at the beach, indicating high-hazard surf and rip current conditions.

On Thursday, a couple from​ Pennsylvania died in a rip current on Florida's East Coast while on vacation with their six children.

T​he incident happened at Hutchinson Island, a barrier island in Martin County about an hour north of West Palm Beach.

The Martin County Sheriff's Office identified the victims as Brian Warter, 51, and Erica Wishard, 48.

T​hey were swimming outside of an area farther up the beach that's protected by lifeguards and where red flags warned of the danger.

A​lso on Thursday, a 19-year-old visiting Panama City Beach from Oklahoma drowned after getting separated from a friend, reported. Fire Chief Ray Morgan said the young man was swimming under single red flag conditions.

P​anama City Rescue lifeguards pulled him out of the surf and started CPR but they were unable to save him.