New York (AFP) - Oil and gas prices plunged, stock markets soared and the dollar retreated Wednesday after the United States and Iran agreed to a temporary ceasefire that could lead to the Strait of Hormuz reopening.

“A wave of relief has hit financial markets after threats of a devastating escalation of the war were replaced by a temporary truce,” said Susannah Streeter, chief investment strategist at Wealth Club.

The most widely traded oil contracts fell some 15 percent to around $95 a barrel, after more than a month of conflict that killed thousands and hammered global markets.

But on Wednesday, investor relief sent markets soaring, with Wall Street’s three main indexes climbing more than 2.5 percent.

Europe’s main continental bourses all closed up more than three percent. Frankfurt led the way with a five-percent gain while London gained 2.5 percent, held back by weak oil companies.

Earlier, Tokyo stocks jumped 5.4 percent and Chinese indices rose around three percent.

The dollar, a safe haven in times of market turmoil, slid against the euro, yen and British pound as investors returned to riskier assets.

But traders warned that the euphoria could be short-lived. Both sides have threatened to resume hostilities if the two-week pause does not lead to an agreement.

“In reality, the markets are not pricing in peace but a window for negotiation,” said John Plassard of Cite Gestion.

“And that is precisely the issue: In two weeks, either this window will lead to a lasting agreement, or it will only postpone and amplify the energy shock that everyone fears,” he said.

Fractures of the deal started to emerge as Israel launched its heaviest bombardment of Lebanon since Iran-backed militant group Hezbollah joined the war in early March, killing at least 112 and wounding hundreds across the country, according to authorities.

Angelo Kourkafas, investment strategist at Edward Jones, described Wednesday’s financial market response as “a big relief rally” but indicated more bumps were likely.

“Every development in this war has been pretty much unpredictable and we still … remain in a headline-driven market,” he told AFP. “Potentially, there’s going to be more volatility.”

Oil prices remain much higher and equity prices lower than before the United States and Israel attacked Iran on February 28.

“I don’t think we’re going to (quickly) go back to the levels we were at before the war,” said Kathleen Brooks, research director at XTB traders. “Energy infrastructure across the Gulf has been targeted.”

Maritime monitor Marine Traffic noted that two ships had transited the waterway since Iran agreed to reopen it, through which about 20 percent of the world’s oil passes.

But one major German shipping company, Hapag-Lloyd, said it was too early for its trapped ships to leave the Gulf.

Shipping journal Lloyd’s List estimated that around 800 ships have been stuck in the Gulf since the end of February.

The International Air Transport Association said that it would take months for jet fuel supplies and prices to normalize.

“Should talks falter or activity through the strait remain subdued, oil prices and the dollar could reverse course fairly quickly,” said Matthew Ryan, head of market strategy at global financial services firm Ebury.

Shares of oil producers fell sharply while airlines were among the biggest beneficiaries.

- Key figures at around 2020 GMT -

Brent North Sea Crude: DOWN 13.3 percent at $94.75 a barrel

West Texas Intermediate: DOWN 16.4 percent at $94.41 a barrel

New York - Dow: UP 2.3 percent at 47,649.73 points

New York - S&P 500: UP 2.1 percent at 6,755.68

New York - Nasdaq Composite: UP 2.5 percent at 22,576.95

London - FTSE 100: UP 2.5 percent at 10,608.88 (close)

Paris - CAC 40: UP 4.5 percent at 8,263.87 (close)

Frankfurt - DAX: UP 5.1 percent at 24,080.63 (close)

Tokyo - Nikkei 225: UP 5.4 percent at 56,308.42 (close)

Hong Kong - Hang Seng Index: UP 3.1 percent at 25,893.02 (close)

Shanghai - Composite: UP 2.7 percent at 3,995.00 (close)

Euro/dollar: UP at $1.1667 from Tuesday’s $1.1595

Pound/dollar: UP at $1.3405 from $1.3291

Dollar/yen: DOWN at 158.353 yen from 159.62 yen

Euro/pound: DOWN at 87.02 pence from 87.22 pence

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