A rescue operation is underway after a tour boat with dozens of South Korean tourists on board collided with another vessel and sank on the Danube River in Budapest, Hungary.

Some 33 South Korean nationals and two Hungarian crew members were aboard the 'Mermaid' cruise when the ship collided with another vessel just outside the Parliament building in the Hungarian capital on Wednesday evening, the country's foreign ministry said.

Másodpercek alatt elsüllyedhetett a Dunán a Hableány hajó https://t.co/4etaQsMMEbpic.twitter.com/8T6Kp2i73K — 12 óra (@LapszemleCom) May 29, 2019

Seven Koreans drowned in the incident, while 19 others are still missing, the ministry claimed. Local authorities also confirmed the number of casualties.

Felborult és elsüllyedt a Dunán egy hajó a Parlamentnél, sajtóinformációk szerint hárman meghaltak https://t.co/ZOy7AX0j8y — Keleten (@Keleten_hu) May 29, 2019

Rescue crews, including a fire department's boat, are on the scene as search for the others continues.

Tragédia!!! Súlyos hajó baleset a Dunán! Több embert nem találnak! pic.twitter.com/ba4gjsIOR4 — László Ámit (@amit_laszlo) May 29, 2019

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