Support for German Chancellor Angela Merkel's conservatives has dipped below the 30 percent mark for the first time, a poll showed on Tuesday, with her Social Democrat (SPD) coalition partners gaining slightly a year before a federal election.

The INSA survey in Bild newspaper put Merkel's conservatives down 0.5 percentage points at 29.5 percent, the lowest level measured for the bloc by that polling institute.

The SPD gained 1 percentage point but was still far behind at 22 percent and the anti-immigrant Alternative for Germany (AfD) was unchanged on 15 percent.

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