Reports in German suggest police are now examining a note and video made by the suspect before the attack.
Polizei Südosthessen, a police station in Offenbach near Frankfurt and Hanau tweeted that a suspect had been found dead. Their information suggested the gunman had committed suicide at his home after fleeing in a dark vehicle, but the motive for the attacks is unclear.
This story was reported by The Associated Press.
Soon afterward, shots were fired at a second shisha bar - the Arena Bar and Cafe in Kurt-Schumacher-Platz in Kesselstadt District.
The attacker, or attackers, fled the scene by auto, according to police.
"The suspected perpetrator has been found dead", police in the central state of Hesse said, adding: "There is now no indication that there are additional perpetrators".
The shooter left a letter acknowledging his actions and expressing far-right views, Bild reported.
A silver Mercedes-Benz covered by what looked like a survival blanket could be seen behind a police cordon and surrounded by officers in front of the "Arena Bar", with shattered glass on the floor.
Forensic experts in white overalls collected evidence from the scene.
Some of the victims were of Kurdish origin, Bild said, without naming the source of its information.
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Update (2/19/2020, 11:00 p.m.): This article has been updated to reflect that police have found the suspect dead in their home.
Turkey's ambassador said five of the people killed were Turks. "The investigations into the identity of the victims and the perpetrator are ongoing".
"There are no indications that other suspects were involved".
Police from neighbouring Bavaria had been deployed to help their local colleagues and a journalist for the AFP news agency reported about 30 police cars leaving Hanau police station. It has about 100,000 inhabitants and is in Hesse state.
"You could not imagine a worse night".
Hanau mayor Claus Kaminsky told Bild: "This was a awful evening that will certainly occupy us for a long, long time and we will remember with sadness".
"This was a awful evening", he said, "that I am sure we will be dealing with and remembering with sadness for a long, long time". "Hopefully the injured recover swiftly". It is a horrific scenario for us all.
"Racism is a poison, hatred is a poison and this poison exists in our society and it is already to blame for far too many crimes", Merkel said in Berlin. "We wish the injured a speedy recovery", added Maas.
Last night's terrorist shooting in Germany, killing nine people, reportedly including several Turks, is a sign of the "poison" of Islamophobia spreading in the heart of Europe, said Britain's largest Muslim umbrella group on Thursday.
"This poison exists in our society and its is responsible for far too many crimes", Merkel said, citing killings committed by a far-right gang known as the NSU, the fatal shooting past year of a regional politician from her party, and a deadly attack on a synagogue in Halle in October.