OSLO, Norway — A police official says the man who gunned down 84 people on a Norwegian island may have had 30 minutes for his killing spree.

Johan Fredriksen said Saturday a SWAT team was put on standby after a bombing in Oslo that killed seven people. One man is thought to have planted the bomb and then headed to the island for the massacre.

When asked how long it took the SWAT team to arrive at the island after the shooting began, Fredriksen said: "It takes the time it takes to drive fast." He said that was about 30 minutes.