The son of Nigeria's top envoy to Hong Kong was yesterday allowed two more days to locate two foreign witnesses over his alleged assault on a senior police officer. Oluwaseni Olusanmokun, 20, faces one count of possessing a stun gun without a licence and one of wounding with intent. His trial was scheduled to start yesterday at the District Court but Judge Fergal Sweeney adjourned it until tomorrow at the request of his lawyer. Barrister James Chandler said he had only received instructions to defend his client last Friday and did not know about the overseas witnesses, who are in Korea and the United States. Judge Sweeney said he was surprised by the application and asked why they had not been contacted earlier. Mr Chandler replied: 'An hour ago, I was not aware of any defence witnesses.' Co-accused Derek Xavier Christiaanse, 19, a barman, was charged with one count of obstructing a police officer. His counsel, Giles Surman, said he agreed to an adjournment. The trial date was set on May 15, almost four months ago. No pleas were taken yesterday, but Mr Chandler indicated Olusanmokun would plead not guilty to both charges. He said he expected the trial to last six or seven days. Olusanmokun has been remanded in custody since April 4. Christiaanse was released on $1,000 bail. Olusanmokun is accused of wounding Michael Armstrong, 35, the assistant divisional commander for Castle Peak, causing him grievous bodily harm in the early hours of February 3 this year outside the Devil's Advocate bar in Wan Chai.