After the rampage in Heidelberg with one fatality, a 32-strong investigative team called "Botanik" was set up. Under the direction of the Heidelberg public prosecutor's office, they are primarily investigating the origin of the weapons and the suspect's motive, said Baden-Württemberg Interior Minister Thomas Strobl (CDU) on Tuesday after a cabinet meeting in Stuttgart. Strobl also gave further details about the course of events: the suspect's father reported to the police on Monday afternoon.

The first emergency calls were received at 12:24 p.m. on Monday, Strobl said.

Six minutes later, the first patrol cars arrived at the Neuenheimer Feld campus.

At 12:32 p.m., the father called the police in Heidelberg and reported a Whatsapp message from his son, in which he announced the crime.

It was already known that the eighteen-year-old was said to have sent a Whatsapp message immediately before the crime, saying that "people have to be punished".

According to previous information, the suspect, a life sciences student, broke into a lecture hall where a tutorial was taking place with a side-by-side shotgun and a bolt-action rifle.

He shot a 23-year-old student in the head, Strobl said.

The woman later succumbed to her injuries.

A 19- and a 21-year-old and a 21-year-old man were also injured with minor to moderate injuries.

The perpetrator then apparently ran outside in the direction of the botanical garden and shot himself there. Police officers found him dead, Strobl said.

There were more than a hundred rounds of ammunition in his backpack.

According to initial findings, the eighteen-year-old had obtained the weapons abroad.

His apartment in Mannheim was searched and digital devices confiscated there are being evaluated. 

The motive of the student, who was previously inconspicuous to the police, is still unclear, Strobl said.

There is no evidence of a politically or religiously motivated crime.

Whether the suspect was under psychiatric treatment is the subject of the ongoing investigation. 

The minister could not say whether the victim and the suspect knew each other.

Both studied life sciences, he said.

However, he was told that students were divided into cohorts, at least for the tutorials, and that the two were not in the same cohort.