Employees of a hotel in the town of Passau found the three bodies and two crossbows in a room.
According to local media two crossbows were found in the room by police when officers searched the scene in the remote riverside hotel near the Austrian border.
The bodies of a 53-year-old German man and two German women, aged 33 and 30 were discovered, according to Passau Police. The man and the older woman are from the state of Rhineland-Palatinate in southwestern Germany, while the younger woman was last registered as living in Wittingen in Lower Saxony, in the north of the country.
Two more bodies were found on Monday after three people died over the weekend after being impaled by crossbow bolts.
The guesthouse which stands near the Ilz river surrounded by trees in Passau, Bavaria, where two women and a man were found dead on Saturday.
Bavarian police spokesman Stefan Gaisbauer said earlier Monday there are no indications that anyone other than those found dead were involved but that it is not yet clear what happened.
The 30-year-old woman - found in a pool of blood on the floor with an arrow through her chest - is reportedly the sister of one of the Wittingen women.
A police spokesperson confirmed that the two corpses in Wittingen, Lower Saxony, had not been killed by crossbow bolts, "the modus operandi can not be compared".
By Saturday evening police announced that there was no further evidence at the guesthouse and it reopened for business.
A hotel manager told the Daily Beast that the trio arrived late on Friday night local time, in a white ute after battling through driving rain. The second woman was found in a pool of blood on the floor.
Initial results from the post-mortem investigations were expected by Tuesday morning, police said.
Crossbows can be purchased legally in Germany by anyone over 18.