The far-right AfD’s surge in state elections in the eastern German state of Thuringia on Sunday is making it harder for mainstream center-right and left parties to form a coalition government.

The anti-immigrant, Islamophobic Alternative for Germany (AfD) came in second in the ex-communist state, more than doubling its vote share to 23.4%, according to official results announced on Monday.

Read more: Far-right’s surge shakes up German politics