A daylight explosion on the Northern Bridge injured two people as Germany pledges new funding for interceptor drones.
The German chancellor travelled to Ukraine with defence executives to sign joint weapons production deals ahead of a difficult winter.
Eight CDU regional premiers have issued a joint statement to head off talk of a leadership swap before critical elections on Sunday.
Demonstrators block roads and demand a party ban after the AfD takes nearly 44 per cent of the vote in Saxony-Anhalt.
