3:28 pm EST - Rune Håkonsen, who works with Norwegian broadcasting corp, tweets images of what appear to be people swimming away from Utoya Island. The Guardian notes that Norwegian television is "showing images taken from a helicopter showing people swimming in the water off Utoya Island, presumably they threw themselves into the sea to get away from the gunman. An eyewitness has reported bodies of people who had been shot floating in the water." Updated (3:53 pm): From the Associated Press, an aerial view of Utoya Island on July 21:

3:05 - Reuters is now reporting that at least seven have been killed in the Oslo bombing. In the linked Utoya Island shooting, there have been only unconfirmed reports of the number killed, according to BBC News.

3:00 pm EST - MSNBC.com relays from NRK (Norwegian TV) that police are "saying they now suspect one or more bombs may be at the scene" at Utoya Island, where the shooting purportedly took place.

2:55 - The Telegraph relays that Norway police have "arrested the assailant, and we believe that he's connected to both the bombings in Oslo and the shootings" at the nearby Utoya Island. The Associated Press has a newsbreak from an eyewitness speaking to Norwegian TV: "he saw more than 20 bodies" at the shooting.

2:48 - From a Reuters photographer, rescue workers at the site of the downtown Oslo bombing at the government building. Previously, the BBC had reported that there was still injured people inside the building.

2:42 - Terrorism expert Will McCants, via The New York Times, translates the statement issued by the group, Helpers of the Global Jihad, which claims "the attack was a response to Norwegian forces' presence in Afghanistan and to unspecified insults to the Prophet Muhammad." From McCants' translation: "We have warned since the Stockholm raid of more operations. What you see is only the beginning, and there is more to come."

2:39 - The mayor of Oslo tells CNN that he believes the situation has stabilized, but is unsure if bombing was terror attack: "This situation is under control, but it's been a terrible day...Today we think about the people in all other parts of the world who have been in the same situation."

2:28 - From Google Translate, an account of the moments leading up to the shootings on Utoya Island, given to the Associated Press (in Norwegian) by a security guard stationed at the youth meeting. The shooter was previously described as a man disguised as a police officer:

"There comes a silver van. In it sits a police officer wearing a police uniform and bulletproof vest. He comes out of the car, and show identification. Says that he is sent to check the safety, it is routine during the terrorist attack. Everything looks good, and [he] is called a boat carrying him over to Utøya. It took a few minutes, we heard the shooting."

2:25 - Via USA Today, President Obama's response: "After a meeting with New Zealand Prime Minister John Key, Obama said the attacks are the latest reminder that the world has a common duty to stop terrorism."