June 9 (Reuters) - Major Gulf stock markets rallied early on Tuesday after Iran and Israel announced a halt to their tit-for-tat attacks, while Tehran vowed to resume hostilities if Israel continued targeting Hezbollah in Lebanon.

The biggest direct confrontation between the two countries since April threatened to undermine Washington’s efforts to reach an agreement to end the more than three-month-long war with Tehran.

In the previous session, most Gulf markets declined as the latest Israeli strikes on Iran and attacks in Lebanon undermined hopes of ending the broader regional war in the near term.

In an interview with Axios, US President Donald Trump said he warned Israeli Prime Minister Benjamin Netanyahu that if he goes back to war with Iran, he might find himself fighting alone.

Saudi Arabia's main index rose 1 percent, with shares of National Commercial Bank, the kingdom's largest bank by assets, climbing 3.1 percent. Shares of oil giant Saudi Aramco fell 0.8 percent.

Brent crude futures fell $1.14, or 1.2 percent, to $93.11 a barrel by 0630 GMT.

Washington is urging Tehran to open the Strait of Hormuz, which carried about a fifth of the world's oil supply before the outbreak of the US-Israeli war on Iran in late February.

The index in Dubai rose 1.1 percent, driven by a 1.3 percent increase in shares of Emirates NBD Bank and a 0.9 percent rise in shares of Emaar Properties.

The index in Abu Dhabi rose 0.8 percent.

The Qatari index rose two percent, supported by a two percent increase in shares of Qatar National Bank, the largest bank in the Gulf.

The index fell by more than two percent on Monday.