The Coast Guard is investigating the source of dark, greasy balls of oil that have washed ashore on South Florida beaches.

Authorities are working to recover the wreckage of a plane crash in western Alaska that killed 10 people while investigators are trying to determine what caused the small commuter aircraft to go down in the icy Bering Sea.

Beachgoers from Palm Beach to Broward counties had their Saturday beach day interrupted when tar balls started washing up along the shoreline, possibly due to an oil spill from a freighter or cruise ship, officials say.

Acting Commandant Adm. Kevin Lunday did not say why the anti-harassment policy was put on hold, but his message emphasized that harassment is still prohibited by military general order. Hate incidents will continue to be investigated per current rules, Lunday said.

Marines began to hang temporary barriers along a wall in San Ysidro, Calif., marking the U.S. border with Mexico as an Air Force flight crew prepared to take off from Texas to Ecuador with the military’s fourth planeload of deported migrants.

The U.S. Coast Guard said that it will be surging ships, boats and aircraft to South Florida and other areas of the country to bolster anti-maritime migration efforts to comply with President Donald Trump’s executive order to use the nation’s military to defend the border.

Adm. Linda Fagan, commandant of the Coast Guard, was fired from a position she’s held for more than two years, according to an announcement sent to the service Tuesday morning.

National Guard troops on full-time active duty are now eligible to enroll in a tax-advantaged, health care flexible spending account, according to a spokesman for the Department of Defense.

Coast Guard members opened fire off the coast of San Diego to disable a vessel smuggling people into the U.S. after two Mexican men on the boat attempted to evade a service patrol by ramming into them.

Icy conditions proved problematic for a bulk freighter on the St. Clair River near Harsens Island on Tuesday before two ice cutters and the Coast Guard helped it on its way.