British gunman's twin among dead

A gunman who killed 12 people in a shooting rampage on Wednesday targeted his own twin brother, police said as they sought for a motive.

12 killed, 11 wounded in numerous attacks

Police guard the scene of a shooting Wednesday on Duke Street in Whitehaven in Cumbria, northwest England. ((David Moir/Reuters))

A gunman who killed 12 people in a shooting rampage on Wednesday targeted his own twin brother, police said as they sought for a motive.

Police on Thursday were searching crime sites and interviewing witnesses to try to determine why Derrick Bird, 52, may have gone on a three-hour shooting spree and taken his own life, officials said. The attacks left 11 people wounded.

In addition to Bird's twin brother, David, another victim killed was Kevin Commons, a lawyer who did work for Bird's family, police said.

British police released a list of locations where investigators believe shots were fired, in an effort to encourage witnesses to come forward, police said.

The list identifies 19 locations, including a wooded area where the suspected gunman was found dead.

The taxi driver's body was found in woods near Boot, a hamlet popular with hikers and vacationers in England's hilly, scenic Lake District. But police believe the series of shootings began in the coastal town of Whitehaven, about 560 kilometres northwest of London.

Cumbria police released this picture of Derrick Bird, the suspect in Wednesday's deadly shootings. ((Cumbria Constabulary))

Police warned residents to stay indoors as they tracked the gunman's progress across the county. Witnesses described seeing the gunman driving around shooting from the window of his car.

"He just opened up with a single-barrel shotgun with a telescopic scope on it," said taxi driver Don Reed, who was among those shot.

"He then drove up by me and just pointed it at me, and I just took a flying dive and he caught me in the back — he shot me in the back."

Police initially said 25 people had been wounded, but Home Secretary Theresa May said Thursday that 11 people were treated in hospital.

Officials said eight people remained in hospital, with four listed in stable condition and four in good condition.

Police examine scenes

Police are now trying to pinpoint the exact time and location of the shootings, and establish what sparked them.

"We have now concluded a 150-kilometre land and air search of the known and possible routes he could have used, and as a result we are not expecting to find any further victims," police said in a statement posted online.

Floral tributes outside the taxi rank on Duke Street in Whitehaven in Cumbria, northwest England, on Thursday. ((David Moir/Reuters))

There are some reports that he had a falling out with colleagues, while other reports suggest that Bird was involved in a dispute over his mother's will.

But Cumbria's Deputy Chief Const. Stuart Hyde said those suggestions are just speculative.

"We're working to examine each scene," Hyde said. "We've had a little bit of additional forensic assistance from outside, but at this stage, we've got enough people to handle this."

The deadly rampage shocked a country where handguns are banned and multiple shootings have been rare. It's Britain's deadliest mass shooting since 1996.

British Prime Minister David Cameron said more than 100 detectives are taking part in an investigation. At a news conference Thursday, Cameron gave his condolences to the shooting victims and their families. He said investigators have recovered two weapons.

"We know that Derrick Bird was a licensed firearms holder," Cameron said. "Police are now investigating whether the licences covered the firearms that were seized."

Cameron said he plans to go to Cumbria on Friday to meet police and officials ensure they have everything they need to conduct their investigation.

"We must do absolutely everything to complete this investigation, to make sure that everything is done — to make sure that events like this cannot happen again in our country, and to help bring those communities back together."

With files from The Associated Press