Armed robbers stole The Scream and another masterpiece by Norwegian artist Edvard Munch yesterday in a bold daytime raid on an Oslo museum packed with terrified tourists.

Two masked robbers ran into the Munch Museum, threatened staff with a handgun and forced people to lie down before grabbing The Scream, an icon of existentialist angst showing a waif-like figure against a blood-red sky, and Madonna.

Some stunned tourists said they feared they were victims of a terror attack. The men yanked the masterpieces from the wall, walked out the front door and escaped in a black Audi car driven by a third man who had been waiting outside, police said.

Worth millions of dollars, the pictures are among Munch's best-known even though he produced several similar versions of both. Madonna shows a mysterious bare-breasted woman with flowing black hair.

"We're following all possible leads... but we don't know who did this," police detective chief inspector Kjell Pedersen told a news conference. One of the thieves spoke during the robbery - in Norwegian.

The paintings were later cut from their frames which were found smashed and scattered in an Oslo street. The car was separately found abandoned a few kilometres away.

Munch, a founder of modern expressionism who lived from 1863 to 1944, painted both works as part of a series about love, angst and death.

Art experts speculated the thieves might demand a ransom because the works were too well known to be sold on the open market. But, Mr Pedersen said: "We have heard nothing".

Police cordoned off the museum, informed Interpol and alerted airports and border crossings. No shots were fired but a female guard was treated for shock.

"I saw one of the men put a gun right behind a guard's head," said Richard Marcus, a 63-year-old Texas businessman visiting Oslo. "It took a long time for the police to come."

"Some people were lying on the floor; I don't know if they were forced to or were just scared," said Anna Leiherr, a 22-year-old German student.

Czech student Marketa Cajova said visitors feared the attackers were terrorists. "He had a black face mask," she told NRK radio.

Another and perhaps better known version of The Scream was stolen from Norway's National Gallery in a break-in in February 1994 on the opening day of the Winter Olympics in Lillehammer.

The 1893 version of The Scream stolen yesterday is a fragile tempera and pastel on board. "It's impossible to say which is the best work," said Gunnar Soerensen, head of the Munch Museum. A third, less well-known, version is in private hands.

In 1994, the government refused to pay a ransom for The Scream and police caught the thieves and recovered the picture a few months later. Those thieves, including one who stole another Munch painting in 1988, are now out of jail.

One Norwegian art expert estimated The Scream stolen yesterday would fetch $60-$75 million if legally sold at auction and Madonna $14.92 million.

In the foreground of The Scream, on a road with railings, is a human figure with hands to the head, eyes staring, mouth agape. Further back are two men in top hats and behind them a landscape of fjord and hills in wavy lines against a red sky.

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