http://www.bbc.co.uk/news/world-us-canada-20730717#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa'27 dead' in Connecticut primary school shooting
As many as 27 people have been killed, including 18 children, in a shooting attack at a primary school in the US state of Connecticut, US media say.
State Police spokesman Paul Vance would not confirm the number of deaths.
US media identified the gunman, who died at Sandy Hook Elementary School, Newtown, as Ryan Lanza, 24, said to from New Jersey.
If the death toll is confirmed, Newtown would be the second-worst US shooting, after 32 died at Virginia Tech in 2007.
Friday's shooting is the third major gun attack in the US in 2012.
In July an attacker killed 12 people at a premiere of a Batman film in Aurora, Colorado. In August six people died at a Sikh temple in Wisconsin.
Children's 'eyes covered'
Connecticut Governor Dannel Malloy is meeting the families of the victims, a spokesman said, and is expected to visit the school later in the day. He is expected to make a statement at 15:30 EST (20:30 GMT)
US President Barack Obama is also due to deliver remarks on the shooting 15 minutes earlier.
The American flags on Capitol Hill in Washington DC have been lowered to half-mast in the wake of the attack.
Sandy Hook School - described by correspondents as a highly rated school has more than 600 students in classes from Kindergarten to 4th Grade - spanning the ages five to 10.
Police arrived at the school soon after 09:40 local time (14:40 GMT), answering reports that a gunman was in the school's main office and one person had "numerous gunshot wounds".
Scores of officers at the scene carried out a full search of the site. Classes were cancelled as the situation developed.
Schools across the district were immediately on lock-down as a preventive measure, officials said.
According to US reports, the gunman's mother was a teacher found among the dead at the school. The Associated Press said his brother was being held by police.
The attacker was dressed in black and wearing a bullet-proof vest during the attack, and reportedly used a .223-calibre rifle. Other weapons are also said to have been recovered.
With the death toll rising, it emerged that one entire classroom of students may remain unaccounted for, local sources reported.
Three other people were taken to hospital and are reported to be in "very serious condition", Danbury Mayor Mark Boughton told CNN.
One witness speaking to CNN said that shots were heard coming from the hall. There "must have been 100 rounds" fired, she told the channel.
Local media have reported that firefighters instructed children to close their eyes and run past the school's office as they exited the building.
Other sources suggest that some of the shots were fired in a school classroom.
There were early unconfirmed reports of two shooters, but no further details of a second gunman mentioned by police.
With the children now evacuated, aerial images of the school show emergency vehicles still at the scene and scores of cars surrounding the area.
Parents and children were seen weeping and comforting friends and family at the school as the scale of the shooting gradually became clear. Officials say they are trying to unite children with their parents.
