London, Sep 23 - Hollywood star John Travolta allegedly refused medical aid for his dying son, a court heard Tuesday.

Travolta was blackmailed for 18 million pounds after saying he didn't want 16-year-old Jett, who had suffered a huge seizure, driven to a local hospital from the family's home in the Bahamas and wanted him to be flown back to the US for treatment, reports imdb.com.

Eventually a paramedic at the scene asked a senior police officer to witness the signing of a 'refusal of medical attention' form.

The court in Nassau, in the Bahamas, then heard how paramedic Tarino Lightbourne allegedly threatened to make the actor's decision public unless Travolta -- who also has a nine-year-old daughter, Ella, with wife Kelly Preston -- handed over the huge sum of money.

Police inspector Andrew Wells said Travolta's alleged request to take Jett to the island's airport instead of hospital was the first time in 27 years he had encountered such a request.