Is a bew up microwave safe to use?!

Is a bew up microwave safe to use?

I bew up my microwave?Is it safe to still use it?
I accidentally turned the microwave on without putting anything in it. After a few seconds, I heard a buzzing noise and saw that microwave had some orange light in it, kind of like sparks. And after opening it, I saw that towards it's right on top, there is some grey/smokey stain. Other than that, it was fine and it is working. I am just scared to heat any food in it. Is it safe to use? Is there any kind of lead or radio poisoning danger through the food heated in it? Is it any harm to pregnant woman or kids?Thanks so much in advance.

DONT use it , it can cause a fire or poision your food.