Kim Vennell

A US-run naval base in Bahrain is set on fire.

An oil tanker is attacked off the coast of Oman.

And in Tehran's Inghalab Square, thousands of people gather.

Wailing women beat their chests as supporters of the country's supreme leader mourn his death.

In the days since Israel and the US began their assault on Tehran, the scale of the conflict has widened, both from Iran's continued retaliatory attacks and with Israel now expanding its gaze to Lebanon.

More than a dozen explosions rocking the capital, Beirut, forcing residents to flee.

Israel says it's targeting the Iranian-backed armed group Hezbollah, which earlier launched missiles against Israel in retaliation for the killing of Iran's Ayatollah Ali Khamenei.

A fragile peace between Israel and Lebanon, long-time enemies, is now in tatters.

US President Donald Trump, meanwhile, is signalling that US and Israeli strikes on Iran could last weeks.

He says almost 50 Iranian leaders have been killed and that the U.S.

has started sinking Iran's navy, destroying Iranian warships and, quote, going after the rest.

The US also announced its first casualties of the campaign.

Three service personnel killed on a base in Kuwait, according to officials.

Trump says there will likely be more US casualties.

In Tehran, a new leadership council has temporarily assumed the duties of the supreme leader.

But Ayatollah Ali Khamenei's death still leaves the Islamic Republic in its most perilous crisis since the 1979 revolution.

Trump is hoping that will result in regime change that is more friendly to the U.S.

and Israel's interests.

Several officials and analysts, however, think that looks unlikely, at least in the immediate term.

The regime, they say, was meant to outlast one man.