The text does not explicitly state what crimes Mark Jones is accused of, but it does mention DNA evidence found on a weapon that matches the defendant's. The options provided are:
1. Theft, assault, murder and arson
2. Robbery with violence and possession of a dangerous weapon
3. Fraud and embezzlement, corruption
Since the DNA evidence was found on a weapon, it is more likely that the accusation is related to robbery with violence and possession of a dangerous weapon.