A vehicle marked with the words “Iran is Great” caused panic in the streets of London. PHOTO: Twitter.

An independent campaign seeking to improve Iran’s image in the U.K. triggered panic in central London when a large commercial vehicle bearing the words “Iran is Great” parked near the city’s Science Museum, Israel’s Channel 2 reported on Monday.

Concerned Londoners who saw the “suspicious vehicle” informed local police, who then rushed to the scene and cordoned off the area. According to the U.K.’s Daily Mail, the authorities then evacuated the museum and smashed the van’s windows to search for explosives with the help of sniffer dogs.

Finally, police understood they had made a mistake and that the vehicle posed no threat.

The van in question was the property of a German couple who have been travelling across Europe in an effort to alter the public perception of Iran, which is largely negative.

The pair said they became captivated by the Islamic Republic after taking a detour into Iran on their way to India in 2013, and since then have been working to “change world opinion” about the country.

Iran is a leading state sponsor or terrorism and has recently reached a deal with world powers over its nuclear program.