"One window with my face on it has several bullet holes," he said. Foreign minister and party colleague Heiko Maas tweeted that the suspected attack was "unbelievable, disgusting and cowardly".
"We will continue standing by your side for a free, tolerant and diverse democracy," he added. The attack comes as German politicians at all levels increasingly become targets of violence, with police statistics suggesting that most suspects were linked to the far right.
Police figures gathered by weekly Welt am Sonntag this week showed significant increases in such acts in many of Germany's 16 states last year. Attacks on politicians and officials in Thuringia and Saxony, both neighbouring states to Diaby's home in Saxony-Anhalt, more than doubled year-on-year, to 101 and 197 respectively.