VIENNA, Nov 2 (Reuters) - Multiple gunmen opened fire at six locations in central Vienna starting near the central synagogue on Monday, killing at least one person and wounding several others in what the interior minister said appeared to be a terrorist attack.

Several "heavily armed and dangerous" attackers were still on the loose as police shut down and sealed off large parts of central Vienna in a manhunt, Interior Minister Karl Nehammer said. Residents were urged to stay indoors.

"We have brought several special forces units together that are now searching for the presumed terrorists. I am therefore not limiting it to an area of Vienna because these are mobile perpetrators," Nehammer told broadcaster ORF.

Police said on Twitter that at least one person had been killed and several injured, including a police officer. Vienna mayor Michael Ludwig told ORF that 15 people were being treated in Vienna hospitals, and that seven were in a serious condition.

Police also said they had shot dead one of the attackers.

Nehammer said all six locations in the attack were in the immediate vicinity of the street housing the central synagogue.

Jewish community leader Oskar Deutsch said on Twitter it was not clear whether the Vienna synagogue and adjoining offices had been the target and said they were closed at the time.

"We are living in the compound of the synagogue. Upon hearing shots we looked down (from) the windows and saw the gunmen shooting at the guests of the various bars and pubs," Rabbi Schlomo Hofmeister told London's LBC radio.

"The gunmen were running around and shooting at least 100 rounds or even more in front of our building," he said.

Videos circulated on social media of a gunman running down a cobblestone street shooting and shouting. Reuters could not immediately verify the videos.

ARMY TO PROTECT SITES

Austrian Chancellor Sebastian Kurz described what had happened as "a repulsive terrorist attack" and said the army would protect sites in the capital so the police could focus on anti-terror operations.

The attack happened hours before a partial lockdown was due to go into place due to the rising spread of the coronavirus, with restaurants, cafes and hotels shuttered and restrictions on movement at night.

Authorities gave no indication of the identity of the assailants or reason for the attack.

President Emmanuel Macron of France, which has seen two deadly knife attacks in Paris and Nice in recent weeks, issued a statement expressing shock and sorrow.

"This is our Europe," he said. "Our enemies must know with whom they are dealing. We will not retreat."

French officials have ramped up security since the attacks in Paris and Nice, which had suspected Islamist motives. Macron has deployed thousands of soldiers to protect sites such as places of worship and schools, and ministers have warned that other Islamist militant attacks could take place.

In 1981, two people were killed and 18 injured during an attack by two Palestinians at the same Vienna synagogue. In 1985, a Palestinian extremist group killed three civilians in an attack at the airport.

In recent years, Austria has been spared the sort of large-scale attacks seen in Paris, Berlin and London.

In August, authorities arrested a 31-year-old Syrian refugee suspected of trying to attack a Jewish community leader in the country's second city Graz. The leader was unhurt.