The motive of the driver is yet to be ascertained.
The 52-year-old man shot dead his wife, a 14-year-old son and a six-year-old daughter.
Police said no one was injured in the two incidents.
The report indicated that the suspect and the victim knew each other prior to the offence.
It was alleged that the man committed the crimes with the help of adults in the Philippines.
Nine suspects were questioned, but no one was detained.
Authorities are still searching for the original thieves in Romania, as it must also be determined whether the 27-year-old is liable for prosecution after stealing back his car.
The head of Germany’s Federal Criminal Police Office, Holger Münch, has warned of a sharp increase in hard drugs availability.
The suspects were also accused of tax evasion.
FC Carl Zeiss Jena said it was an “unpleasant end” to the game and wished those affected “a good and quick recovery”.
