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

The head of the International Atomic Energy Agency says there is a possibility of both radiological and chemical contamination within Iran’s main nuclear enrichment facility in Natanz.

Israel appeared to be expanding its air campaign on Tehran five days after its surprise attack on Iran’s military and nuclear program, as U.S. President

As Israel pounds Iran with airstrikes targeting military facilities and its nuclear sites, officials in Tehran have proposed a variety of steps the Islamic Republic could take outside of launching retaliatory missile barrages.

We are doing what we need to do,” the Israeli leader told ABC News when asked if he plans on going after Ayatollah Ali Khamenei.

After canceling negotiations with the U.S. scheduled for Sunday, Tehran has signaled it is willing to talk.

Israel faced retaliation from Iran after launching missiles against Tehran's leadership and energy infrastructure as part of "Operation Rising Lion" this weekend. Iran's military responded with a wave of missile strikes against Israel,

Smoke and flames filled the sky over Tehran as Israel struck oil and gas facilities in the Iranian capital and targeted more nuclear facilities during attacks that carried on into Sunday after starting two days earlier.