Belgian investigators are probing a possible terrorist link in a fatal weekend shooting by a lone gunman at the Jewish Museum in Brussels.
The inquiry over the shooting, which killed three people outright and left a young man brain dead, was initially opened for murder and attempted "murder with premeditation".
On Monday the inquiry was transferred to the federal public prosecutor's office authorised to handle terrorist cases and spokeswoman Wenke Roggen said a probe had been opened into "terrorist" assassination.
Police analysis of images from the surveillance cameras at the museum show "a man killing in cold blood ... with great determination", Roggen said.
"These facts combined with the fact the shooting lasted less than a minute and a half leads us to think there may be a terrorist motive," she told a news conference.
Earlier, deputy public prosecutor Ine Van Wymersch said the decision to transfer the case was based on "the identity and nationality of the victims".
They included an Israeli couple in their 50s said to be working for the government, Miriam and Emmanuel Riva.
He was said by Belgian and Israeli news reports to have once worked for Nativ, a government agency that played a covert role in fostering Jewish immigration from the former Soviet Union.
Along with Israel's foreign intelligence agency, Mossad, and its domestic security equivalent, Shin Bet, the Nativ agency was under the authority of the prime minister's office.
All four victims of the shooting, which included a French woman who did volunteer work at the museum and the 24-year-old Belgian museum employee said to be brain dead, were hit by bullets to the face and neck.
The young Belgian was said by Jewish leaders to have died on Sunday of injuries in the Saturday afternoon shooting but Van Wymersch said he was still alive but "clinically dead."
Three chilling security camera videos show the gunman, wearing a cap and sunglasses but with his features hard to make out, walk into the museum entrance, remove a Kalashnikov-style automatic rifle from a bag and shoot through a door.
Van Wymersch refused to confirm or deny reports a camera was strapped to one of the two bags he was carrying, enabling him to film the attack in the same way as did Mohammed Merah, the Frenchman who shot dead several Jews in Toulouse two years ago.
The Derniere Heure tabloid on Monday quoted a source close to the inquiry as saying: "We fear a new Merah."
"The priority of priorities is to find this man. He must be arrested and stopped," said Belgian Home Affairs Minister Joelle Milquet.
"We must reassure members of the Jewish community," she added, after ordering 24/7 police protection at all of the country's synagogues, schools and cultural centres.
Saturday's attack was the first in more than 30 years in Belgium and has revived fears of a return of violent anti-Semitism to Europe.
Pope Francis said in Israel on Sunday he was deeply saddened by the attack.
Staged in the busy heart of Brussels, minutes from a packed streetside jazz festival, it came as the country headed into a crucial general election held alongside a vote for the European Parliament.
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