Amid Israel's massive airstrikes on Iran and the Islamic nation's missile response in two barrages Friday aimed at the Jewish state, residents in both nations are on high alert.

Israel carried out airstrikes inside Iran, making the long-standing conflict between the two countries much more serious.

Israel's airstrikes have severely weakened Iran's nuclear capabilities and military leadership, leaving Tehran with limited retaliatory options.

The Israeli military on Sunday released video it said showed the underground rooms where they found the body of Hamas leader Mohammed Sinwar who is believed to have died in tunnels under a Gaza hospital last month.

He was the younger brother of Yahya Sinwar, the former Hamas leader killed by Israel last year. Hamas did not immediately respond to the claim of his death.

Israel and Iran have opened a new chapter in their long history of conflict. Israel launched a major attack with strikes early Friday that set off explosions in the Iranian capital of

Syrian Observatory for Human Rights reports one dead and two others wounded in the Israeli attack on a vehicle.

For years, Israel and Iran engaged in a shadow war, a series of mostly quiet, often deniable attacks, with Iran frequently operating through allied proxy groups.

The IDF has confirmed that senior Hamas leader Mohammed Sinwar was killed in a May 13 airstrike targeting an underground command center beneath a hospital in Khan Younis, Gaza. Sinwar had succeeded his brother Yahya Sinwar as head of Hamas after Yahya and Mohammed Deif were killed last year.

U.S. stocks opened sharply lower and oil prices jumped after Israel launched airstrikes against Iran. Israel’s defense minister Israel Katz declared a special state of emergency following the attack.