Azerbaijani President Ilham Aliyev has sent a letter of condolence to German counterpart Christian Wulff, AzerTaj state news agency reported.
In his letter, the Azerbaijani leader said that the news of a tragedy in Duisburg has been a source of great sorrow to him.
"I share your grief and express my deepest condolences to you, the families and friends of the dead, and wish the injured soonest recovery," he said.