Police secure a street near to the scene of a shooting in Munich, Germany July 22, 2016. [Photo/Agencies]

MUNICH - Gunmen went on a shooting rampage in a shopping mall in the southern German city of Munich on Friday, killing and wounding many people, police said.

Authorities were evacuating people from the Olympia mall but many others were hiding inside.

The Bavarian Interior Ministry said three people were dead, NTV television reported. A Munich police spokeswoman said multiple people were killed or wounded.

"We believe we are dealing with a shooting rampage," the spokeswoman said.

More than one gunman was believed to be involved and no one had been arrested, she said.

"We believe there was more than one perpetrator. The first reports came at 6 p.m., the shooting apparently began at a McDonald's in the shopping centre. There are still people in the shopping centre. We are trying to get the people out and take care of them."

Police special forces had arrived at the scene, NTV said.

It was not immediately clear who carried out the attack, which took place a week after an axe-wielding teenager went on a rampage on a German train. Islamic State claimed responsibility for that attack.

Staff in the mall were still in hiding, an employee told Reuters by telephone.

"Many shots were fired, I can't say how many but it's been a lot," the employee, who declined to be identified, said from the mall in Munich.

"All the people from outside came streaming into the store and I only saw one person on the ground who was so severely injured that he definitely didn't survive,"

"We have no further information, we're just staying in the back in the storage rooms. No police have approached us yet."

Munich transport authorities said they had halted several bus, train and tram lines.

The incidents in Germany follow an attack in Nice, France, on Bastille Day in which a Tunisian drove a truck into crowds, killing 84. Islamic State also claimed responsibility for that attack.