ALAPPUZHA: An Alappuzha youth has landed in 10-year jail term in Saudi Arabia following his series of tweets criticising prophet Mohammed.According to Radhakrishnan Nair, his son Vishnu Dev Radhakrishnan, 28, has been undergoing imprisonment in a jail since June 2018.As per the letter sent to the family of Vishnu from the Consular, Passport and visa division of the ministry of external affairs, he was arrested for “cybercrime pertaining to blasphemy and spreading messages against the Kingdom through social media.”"My son, who completed mechanical engineering, had been working as planning engineer there for the past six years. He has made friendship with a Muslim woman in United Kingdom on Twitter and they shared messages. When she spoke against Hindu Gods in one of her conversations on Twitter. Vishnu tweeted something against prophet Mohammed. Following it, he was arrested on June 7, 2018. On September 13, he was given a five-year jail term and a penalty of 1.5 lakh Saudi Riyal. His sentence was increased to 10 years on January 24 as per the direction of higher court," said Radhakrishnan Nair."I have sought the help of union government and union minister of external affairs Sushma Swaraj to release my son from jail. But I have not received any positive reply from them,’’ said Nair, who has retired from Indian Air Force after 21 years of service.