Microwave. The microwave was turned on without anything inside. Microwave was set to high and on

Question

The microwave was turned on without anything inside. Microwave was set to high and on for three minutes. Damage to top inside door. Plastic melted right through with two holes. Also burnt just below that. Inside top frame also burnt right opposite door damage. Is this microwave now dangerous to use? Should it be disposed of? Is it repairable if that is an option? Thanks for your help.

Sincerely,

Angela Whalen