PARIS (AP) — French police have thwarted a suspected bomb attack outside a Bank of America building in Paris, authorities said Saturday. One suspect was detained and another escaped.

The national anti-terrorism prosecutor’s office, or PNAT, told The Associated Press that it has opened an investigation into alleged terrorism-related offenses.

The suspected offenses include attempted damage by fire or by a dangerous means, the manufacture of an incendiary or explosive device, the possession and transport of such devices with the intent to prepare dangerous damage, and involvement in a terrorist criminal association.

A person was placed in police custody.

“Well done to the rapid intervention of a Paris police prefecture unit, which made it possible to thwart a violent act of a terrorist nature overnight in Paris,” Interior Minister Laurent Nuñez said.

“Vigilance remains at a very high level,” Nuñez said. “I commend all security and intelligence forces, fully mobilized under my authority in the current international context.”

RTL radio, citing police sources, reported that the incident took place early Saturday when police officers spotted two suspects carrying a shopping bag near the premises of the Bank of America in the 8th arrondissement of the French capital.

One of the suspects, holding a lighter, was attempting to ignite a device, RTL said, while the second suspect managed to escape. The Paris police prefecture declined to comment.

Since the Iran war broke out, French authorities have increased personal protection of some figures from the Iranian opposition and stepped up security around sites that could be a target, including sites linked to U.S. interests and to the Jewish community, Nuñez said earlier this week.