Fort Lauderdale beach reopened to swimmers Sunday after an oily substance washed ashore. The U.S. Coast Guard is still working to determine the source of the substance but it’s suspected that it could be from an oil spill.

Coast Guard Crews investigated reports of tar balls from Port Everglades to Palm Beach along the coast of the Atlantic Ocean.

After aerial flights and physical searches, the Coast Guard says the little blobs of oil are no longer floating ashore.

Several beaches across Broward County were closed on Saturday after reports of tar bar washed on shore, officials said.

Mysterious tar balls washed up on several Florida beaches, forcing closures and triggering an investigation by the U.S. Coast Guard. Fort Lauderdale’s shoreline was among the most impacted, after the strange oil slicks shut down swimming.

Fort Lauderdale Fire Rescue announced that the oily substance on the beach prompted lifeguards to tell beachgoers to stay out of the water from Riomar Street south to the Port Everglades inlet. That makes up about half of Fort Lauderdale’s beaches, said Guzman.

There's been no evidence that the tar balls came from Port Everglades off the shore of Fort Lauderdale, but giant tanker ships routinely sit near the port. Every day, more than 12

FORT LAUDERDALE, Fla. (Tribune News Service) — South Floridians enjoying a pleasant Saturday at the beach found themselves stepping in dark, greasy balls of oil, possibly because of a spill offshore, officials say. The Coast Guard is now investigating the source.