Iran's foreign ministry said on Monday there were currently no negotiations with the United States but talks were under way with Oman over the management of the Strait of Hormuz.

"We are not currently negotiating with the United States. Our negotiations are with Oman to secure passage through the Strait of Hormuz," said foreign ministry spokesman Esmaeil Baqaei during a weekly press briefing.

That statement contradicts US President Donald Trump who said that new negotiations with Iran would begin on Monday after he decided to hold off on striking the Islamic republic to pursue a deal to end the war entering its sixth month.

Trump told reporters on Sunday that the talks would cover the Strait of Hormuz, a key route for global energy supplies that has become a sticking point in the conflict, and the denuclearisation of Iran.

For its part, Iran said it was nearing a deal with Oman over a new route through the strait, where a tanker reported an explosion nearby on Sunday, underscoring the continued volatility of the strategic waterway.