Moscow (CNN) -- The death toll has risen to seven in a boat collision Sunday in the center of the Russian capital, state media reported. A private boat carrying 16 people collided with a cargo barge on the Moskva River in Moscow then sank, according to Russia's RIA-Novosti official news agency. The people onboard had been celebrating a birthday. Authorities have confirmed seven survivors. Two people are unaccounted for, the news agency said. Rescue efforts are under way, and a crane is expected to arrive at the site of the collision to help free the private boat, which is still wedged under water.
The boat was carrying 16 people attending a birthday party . The collision was on the Moskva River in Moscow . A crane is expected to arrive to help free the private boat, which is still wedged under water .