DUBAI/JERUSALEM: Iran and Israel said on Monday they had halted attacks on each other following an appeal by U.S. President Donald Trump to immediately "stop 'shooting'", although Tehran warned it would resume strikes if Israel continued attacking Hezbollah targets in Lebanon.The exchanges marked the most direct confrontation between the two countries since an April ceasefire and threatened to undermine Washington's efforts to negotiate an end to the more than three-month-old conflict.A source familiar with the matter said Israel had also decided to suspend attacks on Iran.Tehran launched missiles toward Israel late on Sunday, describing the strikes as retaliation for Israeli attacks on Hezbollah strongholds on the outskirts of Beirut.Israel responded by striking a petrochemical plant in southwestern Iran that it said was linked to ballistic missile production. Iran's Islamic Revolutionary Guard Corps (IRGC) said it retaliated by targeting a similar facility in the Israeli city of Haifa.100 days of Iran war: India must brace for broad-based economic shockIran's military said it had delivered a "painful response" to Israel's actions in Lebanon and declared its operations halted for now. However, it warned that any further aggression, particularly in southern Lebanon, would trigger a much harsher response.Hours later, sirens sounded in northern Israel after a projectile was detected falling in an area of southern Lebanon where Israeli forces are operating. No casualties were reported.Israeli Defence Minister Israel Katz said Israel would again strike Hezbollah's Dahiyeh stronghold in southern Beirut if attacks on northern Israel continued.The latest flare-up has complicated Trump's efforts to end the conflict that began with U.S.-Israeli strikes on Iran on February 28. While a ceasefire announced on April 8 halted large-scale warfare, tensions across the region have persisted.Indians are growing more pessimistic about the economy. RBI Survey shows whyIn a series of social media posts, Trump said both Iran and Israel wanted an immediate ceasefire and that peace negotiations were continuing. An Israeli official said Trump had spoken with Prime Minister Benjamin Netanyahu on Monday.Earlier, an Israeli military official said the country was prepared to continue operations "as long as it takes" and confirmed strikes on newly rebuilt Iranian air-defence systems in addition to the petrochemical facility.Iranian officials also adopted a defiant tone. A military source quoted by the semi-official Tasnim news agency said Tehran was prepared for a prolonged conflict and could resume attacks on U.S. interests in the region.