Autopsy results released on Tuesday have shed some light on what happened in the room of a quiet hotel in Passau, near the Austrian border, on Sunday.
On Saturday, hotel staff discovered the three dead German nationals in their room around noon alongside two crossbows.
A third crossbow was later found packed inside a bag, police said. The three were a 33-year-old woman and a 53-year-old man from Rhineland-Palatinate state and a 30-year-old woman from Lower Saxony.
It has also emerged that two wills were found in the room.
The initial autopsy results show that the three died through targeted shots, Spiegel reported on Tuesday.
The 33-year-old woman and 53-year-old man, who were found dead on the bed, were each killed by a shot to the heart.
The 30-year-old woman, who was found lying on the floor near the bed, was killed by a shot to the neck.
Further shots had been fired at the couple on the bed, but investigators said those came after the fatal shot to the heart.
None of the three had shown signs that they were forcibly attacked or that they had tried to defend themselves.
In addition, two wills written by the pair found on the bed were found in the hotel room, said the spokesman for the public prosecutor's office in Passau.
The exact circumstances of death remain unclear. Investigators are trying to establish whether the women and men were under the influence of medication, alcohol or other drugs.
There are no indications that other people might have been involved in the incident, said the spokesman. The investigation so far indicates that the 30-year-old first shot the two on the bed, and then herself.
The two women and men had arrived Friday and had all checked in without luggage.
They only returned to their cars later, after the reception was closed, to get the bags containing the crossbows.
One of the women had booked the triple room for 85 euros a night, without breakfast, for three nights.
“It was a strange group,” a guest recalled, according to the newspaper Bild, saying that the bearded man wore a suit while the women were dressed in black.
They had all wished a “good evening”, taken glasses of soft drink and water, and then disappeared into the second-floor room as rain fell outside.
Two women found dead
On Monday, two days after the hotel discovery, investigators found two more bodies in the 30-year-old woman's apartment in Wittingen, Lower Saxony.
Forensic teams at the site of the apartment in Wittingen, Lower Saxony, where two women were found. Photo: DPA
According to the police, neither crossbows nor arrows were found on the bodies of the two women there. One of the two women is said to have been the partner of the 30-year-old woman who died in Passau.
Police are trying to piece together what happened, how long the women had been dead and how these deaths are linked to the hotel incident.
Crossbows available to over-18s
According to the German Shooting and Archery Association (DSB), 3000 people of about 1.35 million shooter association members in Germany use crossbows.
Anyone over the age of 18 can buy a crossbow according to German law.