Definition of pull in phrasal verb from the Oxford Advanced Learner's Dictionary

Phrasal Verbs
(informal) to bring somebody to a police station in order to ask them questions about a crime

    pull in (to something)

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  1. 1  (of a train) to enter a station and stop See related entries: Train and bus travel
  2. 2  (British English) (of a vehicle or its driver) to move to the side of the road or to the place mentioned and stop The police car signalled to us to pull in. See related entries: Driving
See the Oxford Advanced American Dictionary entry: pull in