The death toll from U.S.-Israeli attacks on a bridge in Iran's northern Alborz province on Thursday has risen to 13, the official news agency IRNA reported Friday.

The victims, including four women, were civilians from various backgrounds, including municipal workers, IRNA quoted Amir-Hossein Daneshkohan, director general of the provincial Foundation of Martyrs and Veterans Affairs, as saying.

Significant sections of the B1 Bridge are seen destroyed after an airstrike attributed to the United States and Israel targeted the site near Tehran, in Karaj, Iran, on April 3, 2026. (Photo: VCG)

The B1 bridge, located in the provincial capital Karaj, is one of the highest bridges in the Middle East and among the most complicated projects in Iran. It was targeted twice with missiles on Thursday, and the attacks also wounded 95 people, IRNA said.

Among those killed and injured were residents of Bileqan village, passengers, and the families gathered nearby for Nature Day, a traditional Iranian holiday marking the end of the Nowruz holidays, said Qodratollah Seif, the province's deputy governor for political, security and social affairs.

Daneshkohan added that 44 civilians have been killed in Alborz province since the war began in late February.

On Feb. 28, Israel and the United States launched joint attacks on Tehran and several other Iranian cities, killing Iran's then Supreme Leader Ali Khamenei, along with senior military commanders and civilians. Iran responded with waves of missile and drone strikes targeting Israel and U.S. assets in the Middle East.