警察

How it works

に (to) points to the target you're acting toward — here, the 警察けいさつ (police). The verb する (do) (here on 連絡れんらく (contact), making “to contact”) shifts to its て (te-form) as して (do) and takes ください (please) to make a polite request. The pattern [verb in te-form] + ください (please) is the standard way to ask someone to do something.