Croatian police have arrested the first officer of the catamaran Krilo Eclipse following a collision with a sailboat near Split on Sunday. Four Czech citizens died in the incident. Authorities suspect the officer may have endangered passenger safety, leading to the arrest. The investigation is ongoing to determine the exact circumstances surrounding the collision. The Krilo Eclipse and the sailboat collided in the Adriatic Sea, prompting a rescue operation. This arrest marks the first official action taken by Croatian authorities in connection with the fatal accident. Further details regarding the charges and investigation are expected to be released as they become available.