The U.S. Transportation Security Administration has instructed airlines to prohibit any liquids, gels, aerosols and powders in carry-on luggage on all flights between the U.S. and Russia ahead of the Olympics games.

The directive, which comes amid heightened concern about terrorism related to the Olympics, follows a U.S. Department of Homeland Security warning to airlines sending flights to Russia that explosives could be hidden inside toothpaste tubes. The games begin Friday in the Russian resort city of Sochi.

The new rules are an outgrowth of the same intelligence that prompted Wednesday's warning, an official said. Passengers will still be able to carry liquids in their checked bags.

Russian security officials announced last month they would ban all types of carry-on liquids, in any quantity, from flights arriving at the two main Moscow-area airports, as a precaution heading into the games. But that prohibition wasn't widely enforced at U.S. airports, which normally allow passengers to carry on liquids in containers smaller than three ounces. Now, there will be a secondary screening at the gates for Russia-bound flights, an official said.

In a posting on its website, Delta Air Lines also said customers traveling between the U.S. and Russia would need to "personally check in with a Delta representative at the airport" rather than using online, mobile or kiosks to check in for flights.

Earlier this week, Homeland Security issued a warning about the potential for explosives to be hidden inside toothpaste tubes.

"Out of an abundance of caution, [Homeland Security] regularly shares relevant information with domestic and international partners, including those associated with international events such as the Sochi Olympics," a Homeland Security official said. "While we are not aware of a specific threat to the homeland at this time, this routine communication is an important part of our commitment to making sure we meet that priority."

A federal law-enforcement official said the alert is largely for airlines operating flights that originate outside the U.S.

Write to Andrew Grossman at andrew.grossman@wsj.com

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