American warplanes and submarines attacked three key nuclear sites in Iran early Sunday, bringing the U.S. military directly into Israel’s war and prompting fears that the strikes could lead to more dangerous escalations across the Middle East.

President Trump said the objective was the “destruction of Iran’s nuclear enrichment capacity.” He claimed success, saying in a televised address from the White House that the nuclear facilities had been “completely and totally obliterated.”

Bahrain, an island nation in the Persian Gulf that hosts an American naval base, warned residents to use main roads “only when necessary” today. The government also asked civil servants to work from home today at a 70 percent rate. The U.S. strikes on Iran have ushered in a period of high alert in the region, where more than 40,000 American troops are on bases and warships, as the Pentagon braces for retaliation.

An Israeli airstrike on a logistics base in Tabriz, northwestern Iran, injured two people, according to the Tasnim news agency, which is closely affiliated with Iran’s government.

Iran fired a barrage of ballistic missiles at targets across Israel on Sunday morning in a volley that wrecked buildings but left relatively few casualties, according to the Israeli authorities, just hours after President Trump announced that the U.S. military struck three Iranian nuclear sites.

At least 16 people were wounded in the Iranian attack, most of them lightly, according to Magen David Adom, Israel’s country’s emergency service. One man was rushed to the hospital in moderate condition with shrapnel wounds, the paramedics said.