Anti-war protests erupted in New York City, Washington, D.C., and other cities across the United States following U.S. strikes on three Iranian nuclear sites.

Around 100 demonstrators rallied in Times Square, holding signs such as "Stop the War on Iran" and "Hands Off Iran," among others.

Similar protests were seen outside the White House in Washington, D.C., according to videos circulating on social media.

The ANSWER Coalition, one of the organizers, said emergency demonstrations were planned in more than 15 cities nationwide.

"(U.S. President Donald) Trump's unprovoked bombing of Iranian nuclear facilities is an outright war crime. It violates the UN Charter, international law and the U.S. Constitution. It threatens to set into motion a regional or even global war with massive casualties, nuclear radiation and catastrophic consequences," said a post on the website.

"We demand an immediate end to U.S. and Israeli attacks on Iran and its sovereignty," urged the Coalition.

The people of the United States want more funding for health care, education and infrastructure, while Trump and his war hawks are launching a new war that endangers the world, sheds the blood of Iranians and eventually Americans, and serves only the interests of the military-industrial complex, said the Coalition.

"President Trump took his faithful decision without Congressional approval, even though it will trigger serious reprisals from Iran and put American soldiers directly in the line of fire. It was done not in response to any imminent threat," said Etan Mabourakh, the organizing manager with the National IranianAmerican Council.

"We urge restraint. We urge diplomacy. Diplomacy is the only way to solve problems. Bombs have never brought liberation," said Mabourakh at the Times Square.

The United States is expected to see more similar protests in the coming days, including a national march in Washington, D.C. on June 28, according to the website.