Oil prices have fallen sharply in morning trade in Asia after US President Donald Trump said negotiations to end the war are progressing - a claim disputed by Iranian officials.

Brent crude fell by 6.6% to $97.56 (Β£72.65) a barrel, while US-traded oil fell by more than 5.5% to $87.20.

Trump said on Tuesday that talks to end the war are happening "now" and that the people the US were in discussions with "want to make a deal so badly".

On Monday, officials in Tehran said claims of talks between the US and Iran were "fake news", as strikes between Israel and Iran continued to be exchanged.

Trump said Vice President JD Vance and Secretary of State Marco Rubio were involved in the discussions to end the war.

The president added that the US-Israeli strikes on Tehran have led to "regime change", repeating his claim that Iranian leaders have agreed that they will never have a nuclear weapon.

But Tehran has previously rejected claims that it had been in contact with the US, calling it an attempt to manipulate markets.

The New York Times, Reuters news agency and Israel's Channel 12 have reported that the US has handed over a 15-point plan to Iran, citing unnamed sources.

Channel 12 said the US' demands included the Strait of Hormuz being opened and that it would be recognised as a free maritime zone.

It also detailed what Iran would receive if it accepted the plan, including the removal of sanctions, according to Channel 12.

The BBC has not seen the document and is working to verify the reports.

Iran and Israel continue to exchange missile strikes across the Middle East.

The Israel Defense Forces (IDF) it has begun a "new wave of strikes" in Tehran, targeting the infrastructure of the "Iranian terror regime".

Israel also warned residents in the southern suburbs of Beirut, Lebanon to evacuate as the IDF continued strikes on Hezbollah.

The IDF said earlier that Iranian missiles had been fired towards Israel.

Major stock exchanges in the Asia Pacific gained in morning trade as investors weighed developments in the Middle East.

Japan's Nikkei 225 and South Korea's Kospi indexes each rose by more than 2%. Both countries are heavily reliant on oil that passes through the Strait of Hormuz.

Australia's ASX 200 index was up by more 1.8%.

Hong Kong's Hang Seng exchange and Shanghai's composite each gained by around 1%.

The drop in oil prices on Wednesday suggests the market now thinks the chances of a prolonged supply disruption and other worst-case scenarios are less likely than before, said Goh Jing Rong from the Singapore Management University.

Trump's remarks have raised hopes that the conflict will ease, but the drop in oil prices will only last if there is a "credible follow-through", such as safe passage for vessels from the Gulf, he said.

Energy prices have soared since the war started, as Iran has effectively blocked the Strait of Hormuz, a narrow waterway which usually sees about 20% of the world's oil and liquefied natural gas pass through each day.

The price of Brent crude rose back above $100 a barrel on Tuesday and even after the latest falls remains much higher than before the US and Israel launched attacks on Iran on 28 February.

Governments around the world have announced measures in recent weeks aimed at easing the impact of rising oil prices on their economies.

The heads of some of the world's biggest companies have warned in recent days about the potential implications of the war.

On Tuesday, the boss of energy giant Shell said oil shortages could hit Europe next month.

Wael Sawan, chief executive of Shell, told an energy industry conference in Houston: "South Asia was first to get that brunt. That's moved to South East Asia, North East Asia and then more so into Europe as we get into April."

Larry Fink, the boss of US financial giant BlackRock, told the BBC that a global recession could be triggered if the price of oil hits $150 a barrel.

The cost of crude could stay above $100 - or possibly closer to $150 a barrel - for years if the conflict is not settled and Iran becomes a country that can be accepted again by the international community, he said.

That would hold "profound implications" on the economy and likely lead to a "stark and steep recession".

The war has caused "imminent danger" to the country's energy supplies, President Ferdinand Marcos Jr says.

Some Iranians dismiss the possibility of talks to end the war, others worry a deal may leave the current leaders in place.

The gas provider says the price rise is temporary but further increases could be on the horizon.

President Trump says the US is already dealing with a "top person" in Iran, but Tehran denies that any talks have begun.

US President Donald Trump has pointed to diplomatic talks to end the offensive - but Israel might not yet be ready to walk away.