Smoke and missiles have lit up the skies in Israel and Iran in a fierce standoff triggered by fears over Tehran’s expanding nuclear program. Since June 13, hundreds of military strikes have been exchanged as the two nations remain locked in a conflict that shows no signs of abating.

The two powers have been exchanging barrages since Israel attacked Iran and killed many of the country’s top military leaders and scientists.

Israel and Iran traded strikes for a fourth day early Monday, damaging two high-rise residential buildings in central Israel, emergency officials said. Magen David Adom, Israel's emergency aid organization,

The Israel-Iran conflict has escalated into its fourth day with mounting casualties, widening attacks, and no sign of diplomatic resolution.

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