Iran said Tuesday it had begun efforts to rebuild residential areas and public infrastructure damaged in Israeli strikes over 12 days.

"We witnessed attacks on residential areas, as well as on scientific centres, research institutes, healthcare facilities and civilians... therefore we are facing a major task ahead in terms of reconstruction," government spokeswoman Fatemeh Mohajerani told state TV, adding that the authorities have begun to assess the extent of the damage.

Oil prices accelerated losses on Tuesday after U.S. President Donald Trump said China can continue to buy Iranian oil, providing reassurance over crude supply in Middle East.

International benchmark Brent slumped 4.5 percent to $68.26 per barrel, while the main US crude contract WTI shed 4.6 percent to $65.34, after plunging earlier over a fragile Iran-Israel ceasefire.

Israeli Prime Minister Benjamin Netanyahu's office said the country "refrained" from further strikes on Iran on Tuesday after he spoke with U.S. President Donald Trump in a call.

Israel accused Iran of violating a fragile ceasefire agreement on Tuesday morning by firing two missiles, with Defense Minister Israel Katz immediately promising "to respond forcefully".

U.S. President Donald Trump said Tuesday he would "probably" meet Ukrainian President Volodymyr Zelensky on the sidelines of a NATO summit in The Hague.

"Yeah probably I'll see him," Trump told reporters on Air Force One.

Gaza's civil defense agency said Israeli forces killed 25 people waiting for aid in the south of the Palestinian territory in the second such incident on Tuesday, bringing the number of aid seekers killed to 46.

Civil defense spokesman Mahmoud Bassal told AFP that 25 people were killed and dozens wounded when "Israeli forces targeted civilian gatherings near Al-Alam and Al-Shakoush areas with bullets and tank shells as they attempted to reach an aid center in northwest Rafah, about two kilometers from a U.S.-backed aid distribution point."

Mediator Qatar’s said Tuesday it was working on resuming Gaza ceasefire talks in days, urging Israel not to exploit a truce with Iran to "unleash everything it wants to unleash" on the blockaded strip.

"We are still continuing our efforts, and God willing, we will try to look for an opportunity during the next two days for having indirect negotiations between the two parties... We hope that the Israeli side will not exploit the ceasefire with Iran to unleash what it wants to unleash on Gaza and continue its bombing of" the strip, said Sheikh Mohammed bin Abdulrahman bin Jassim Al-Thani during a joint press conference with his Lebanese counterpart.

An angry Donald Trump berated Iran and Israel Tuesday for violating a ceasefire deal, adding that he was "really unhappy" with Israel in particular.

The two countries have been "fighting so long and so hard that they don't know what the fuck they're doing, do you understand that?" the U.S. president told reporters at the White House, hours after he had said a ceasefire between the two arch-foes had taken effect.

Iran's Revolutionary Guards said Tuesday that they had taught Israel an "unforgettable lesson" with a last-minute missile salvo fired just before a ceasefire deal announced by U.S. President Donald Trump was meant to take effect.

The Guards said in a statement that "in the final moments before the ceasefire was imposed on the enemy", they had struck "military and logistical centers of the Zionist regime across the occupied territories (Israel) with 14 missiles, delivering a historic and unforgettable lesson to the Zionist enemy".

Iran's top security body on Tuesday said the Islamic republic's forces had "compelled" Israel to "unilaterally" cease fire, adding that they remained "on high alert" to respond to "any act of aggression".

Referring to a "divine gift", the Supreme National Security Council said Iran's actions against Israel led to "victory and triumph that compelled the enemy to regret, accept defeat, and unilaterally halt its aggression".

The health ministry said an Israeli strike killed three people Tuesday in the country’s south, the latest such raid despite a November ceasefire.

"The strike launched by an Israeli enemy drone on a vehicle" in the Nabatieh district town of Kfar Dajjal "resulted in the death of three people", the ministry said in a statement carried by the official National News Agency.