Israeli Prime Minister Benjamin Netanyahu sent condolences to Russian President Vladimir Putin after at least 10 people were killed in a bombing attack on a St. Petersburg subway.

“On behalf of the Government of Israel, I send condolences to President Putin and to the families of those who were murdered following today’s bombing on the St. Petersburg subway,” Netanyahu wrote Monday in a statement hours after the afternoon blast, which also injured dozens more. “The citizens of Israel stand alongside the Russian people at this difficult time.”

The homemade bomb filled with shrapnel detonated in a moving subway car after Putin had arrived in his hometown for a visit. A more powerful bomb was discovered later at a nearby train station and defused.

The attack shut down the entire subway system in St. Petersburg, Russia’s second largest city.

No group has claimed responsibility for the attack.