Criminal Damage is the damage or destruction of property which belongs to another person. Furthermore the damage must be intended, or at the very least a person must be reckless as to the damage. This means that it may be proven simply when you foresee a risk of damaging property and then go on to take that risk resulting in damage.
It is possible to be guilty of Criminal Damage where the property is shared between you and another person or people, provided the other owners did not give permission.
Criminal Damage may be treated as a more serious offence if there has been an injury to another person, or a risk of injury to another person, and the court will take this into account when determining sentence.