Iran warned on Monday of a possible "pre-emptive action" against Israel "in the coming hours", as Israel readies for a ground offensive on the Gaza Strip.
Tehran has repeatedly warned that a ground invasion of the long-blockaded Gaza would be met with a response from other fronts - prompting fears of a wider conflict that could draw in other countries.
"The possibility of pre-emptive action by the resistance axis is expected in the coming hours," Iran's foreign minister, Hossein Amir-Abdollahian said in a live broadcast to state TV, as he referred to his meeting with Hezbollah leader Hassan Nasrallah on Saturday.
Earlier on Monday, Iran's top diplomat and president, Ebrahim Raisi had said time was running out to reach a political solution and warned against the expansion of the Israel-Hamas war to other fronts.
Amir-Abdollahian said on Monday that "the resistance leaders" will not allow Israel "to do whatever it wants in Gaza".
"If we don't defend Gaza today, tomorrow we have to defend against these (phosphorus) bombs in the children's hospital of our own country," he added.
Israel has launched a relentless bombing campaign on the Gaza Strip, killing at least 2,750 Palestinians, including 1,000 children.
The Monday remarks come as Israel prepares for a ground invasion into the trip, where fears for Palestinians trapped in the totally blockaded enclave are mounting.