OSLO, Norway (AP) — Six people were indicted Monday on alleged roles in the brazen daylight theft of the still-missing Edvard Munch masterpieces "The Scream" and "Madonna," a prosecutor said.

Masked gunmen grabbed the versions of two of Munch's best-known works from the Munch Museum in Oslo in August 2004, as stunned visitors looked on.

State's attorney Oslo Terje Nyboe said five of the six people indicted Monday will be tried for participating in the theft, while the sixth was indicted on charges of receiving stolen goods. Police said he briefly stored the artwork before it was moved elsewhere.

None of the six was identified, in line with Norwegian practice regarding privacy.

Despite an international search and the promise of a $300,000 reward by the City of Oslo, which owns the museum, the works have yet to be recovered.

"The Scream," of which there are four versions, has become a modern icon of human anxiety. Art experts contend that both paintings are priceless and too well known for the thieves to be able to sell them.

Under Norway's legal system, police can seek court orders to hold those charged with a crime, usually for four weeks at a time, pending investigation and then possible indictment and trial.

Three of the five people indicted have been held in jail since their arrest during the nine months after the thefts. Two were charged in the theft and released, but face trial.

According to Nyboe, the trial is expected to start in mid-February and last about four weeks. If convicted, the five indicted for the theft could face 17 years in prison while the sixth person could face six years.

Munch developed an emotionally charged painting style that was a major influence on the 20th-century expressionist movement. "The Scream" and "Madonna" were part of his "Frieze of Life" series, in which sickness, death, anxiety and love are central themes. Munch died in 1944 at age 80.