Budapest - The captain of a boat which collided with a smaller sightseeing boat on the River Danube killing at least seven people has been arrested, police in Budapest said late Thursday.
There were personal and material reasons to suspect the Ukrainian national, police said, without giving any further details.
Meanwhile the search for 21 people still missing after Wednesday's incident in the Hungarian capital continued, although hopes of finding the victims alive were small as rescue work was hampered by strong currents and poor visibility.
The body of one person was found kilometres away from the site of the collision, police said.
The smaller boat, Hableany, had 35 people on board - 33 South Korean tourists and two crew members - when it was hit late Wednesday near the Margaret Bridge and sank within seconds.