English Translation
She was caught unarmed by the police.
Wiktionary says: påkommen - past participle of komma på
Something is missing here.
It’s a strange translation which makes it sound as being unarmed is a crime 
“Att bli påkommen” is to be caught doing something embarrassing or improper. (meaning 2 in your Wiktionary link). I would use “infångad” instead.
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By the way, here’s a synonym for påkommen: ertappad.