Israel and Iran have begun a new round of attacks, as the conflict between the two heavily armed rivals enters its fourth day.

Iranian news media and residents of Tehran say the damage from the latest Israeli strikes appears to be significant, with several apartment buildings badly damaged. Residents say they are hearing ambulance sirens and fire trucks racing to the scenes and rescue workers are working to find casualties in the rubble.

The Iran regime is very weak,” Israeli Prime Minister Benjamin Netanyahu said in a television interview. Israeli struck energy facilities and government buildings Sunday.