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US President Donald Trump said on Monday that oil tankers are again exiting the Strait of Hormuz, following a peace deal, but uncertainty persisted over whether Iran will keep imposing tolls on ships in the vital waterway.

Mediator Pakistan announced on Sunday that the United States and Iran had agreed to an “immediate and permanent termination” of military operations, but the text of their peace deal has yet to be released.

The deal is expected to be signed on Friday in Switzerland and be followed by further “technical” talks on a long-term agreement.

Trump said that with the signing, the Strait of Hormuz — a vital waterway for Gulf energy exports — would be reopened and a US naval blockade of Iran would be lifted.