A burglar is an emergency

Boy: Do you think someone will steal your valuables?
Mom: I'm afraid so. There's a lot of crime nowadays.
Boy: So, it's better to lock things up.
Mom: Yes, better safe than sorry. That's why I always set
a burglar alarm. Oh, you're not scared, are you?
Boy: Oh, just a little bit scared. What if someone comes in
the workshop? What would we do?
Mom: We'll call the police.
Boy: Oh, dial 9ll.
Mom: Yes, a burglar is an emergency.
Boy: Oh, what will the police do?
Mom: They'll arrest the burglar, like this, you're under arrest;
come along with me.

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What does "burglar" mean in this sentence?

What does "a burglar is an emergency" mean?

Thank you