RIO LINDA, Calif. -- A German National remains in the Placer County Jail after authorities found him in possession of a large stash of weapons over the weekend.

Federal investigators are now learning about the weekend disovery at the Rio Linda residence of 46-year-old Andreas Koertel.

"Detectives are speaking with him today, and decisions are being made now, as far as who --if anyone -- is going to present the case against this guy," Sacramento Sheriff's Sergeant Jason Ramos said.

Ramos calls the discovery disturbing.

"We have somebody who is not a citizen, who is in possession of numerous passports, items that have been converted into having some kind of explosive properties, a number of weapons that's clearly more than just for personal use," Ramos said.

Koertel's being held on charges including possession of illegal weapons and meth. He's also on an immigration hold.