Israel bombarded the Iranian capital with a new wave of strikes on Sunday afternoon, as both sides warned of more to come in a conflict that is rapidly expanding in scope and intensity.

Iran launched dozens of ballistic missiles toward Israel on Friday night in retaliation for Israel's surprise attack early Friday. Israel struck at the heart of the Iran's nuclear program, killing several nuclear scientists as well as high-ranking military leaders, according to Israeli officials.

Several buildings in Israel’s Weizmann Institute of Science, one of the country’s top research centers, were damaged in an Iranian strike but there were no casualties, its management told its community members.

DUBAI, United Arab Emirates — Israel unleashed airstrikes across Iran for a third day Sunday and threatened even greater force as some Iranian missiles evaded Israeli air defenses to strike buildings in the heart of the country . Planned talks on Iran’s nuclear program, which could provide an off-ramp, were canceled.

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.

Israel's military said the air force had concluded a wave of overnight strikes targeting air defenses in the area of Tehran. "We damaged—and will continue to damage—strategic sites and enemy sources of knowledge,

Videos and images verified by NBC News piece together a picture of the deprivation and chaos of Gaza's hospitals.