Alex Ritson

The president urged Iranians to use the moment to overthrow the Ayatollah.

Plus reporting from our correspondents in the region and analysis from our team, including experts from BBC Persian.

It was a little before 10 o'clock on a bright Tehran morning when the first missiles struck, arriving out of a clear blue sky.

Blasts were heard in cities across Iran as the United States and Israel carried out multiple strikes.

In a video message on social media, President Trump accused the Iranian regime of waging an unending campaign of bloodshed and mass murder targeting the United States.

He had this warning for members of the Iranian security forces.

And he urged the people of Iran to use the opportunity to overthrow the Ayatollah and his regime.

The Israeli Prime Minister Benjamin Netanyahu also had a message for the people of Iran.

Together with the United States, we will strike the terror regime harshly.

We will create the conditions that will allow the brave Iranian people to rid themselves of the burden of this murderous regime.

This is your chance to establish a new and free Iran.

Take your fate into your own hands.

Raise your head, lift your eyes to the sky.

Our forces are there, pilots of the free world.

Everyone is coming to your aid.

Help has arrived.

Reaction from inside Iran itself has been limited as there are restrictions on communications in place.

But earlier, the BBC spoke to Fawood Izadi, who's at Tehran's university.

And Hamid Reza Golamzadeh, who works for a think tank on Iranian foreign policy in northern Tehran, told us what he has heard.

What is Iran's opposition saying?