TEHRAN: For a moment Tehran resembled a city at peace, with birdsong, joggers and tranquil views of the snow-capped Alborz mountains in the distance. Then the sound of another explosion ripped through the air. A week ago, opening strikes by the US and Israel killed Iran’s supreme leader Ayatollah Ali Khamenei, upended residents’ lives and transformed the city streets into a battleground. In Tehran’s west, a block that belonged to the security forces had been blasted apart, and the entire surrounding area was choked with rubble.

Officials say some water, electricity facilities damaged amid US-Israel bombing, but no widespread outages reported yet.

Iranians in the capital tell the BBC of "constant explosions", as the US warned attacks will intensify.