Rome, January 7 - Searches were set to continue off the coast of Venezuela on Monday for Vittorio Missoni, the CEO of Italian fashion house Missoni, and five other people who were on board a small aeroplane that went missing on Friday. Vittorio Missoni is the eldest son of 91-year-old Ottavio Missoni, who founded the company famous for its colourful zig-zag knitwear. He was among four Italians on board the flight, including his wife Maurizia Castiglioni, and another couple. They were on a flight to Caracas after holiday on an island in the Los Roques Caribbean archipelago. "Vittorio Missoni is missing," Vittorio Missoni's son, Ottavio Missoni Jr, said via Twitter on Sunday with a link to a message telling people with information to contact the Italian foreign ministry. "Please help me find my father!". A pilot and co-pilot were also on board the plane. Staff at the Missoni plant near to the family home in Sumirago, in the northern province of Varese, returned to work on Monday without talking to reporters. The Los Roques area is notorious for plane crashes. In 2008 another smaqll plane returning to the Venezuelan mainland from the archipelago disappeared with 14 people aboard, including eight Italians.