Germany's election is too close to call, with the latest polls putting the two main parties fighting to come out top almost neck and neck.
Polls suggest an unusually tight race between outgoing Chancellor Angela Merkel's centre-right CDU and the Social Democrats.
Politicians vying to replace her are to make their final appeals to voters on the last day of campaigning.
Mrs Merkel has dominated German politics for 16 years as chancellor.
She is due to appear at a rally alongside her party's candidate to replace her, Armin Laschet, in the city in Aachen on Saturday.