President Barack Obama has been told about the fatal shooting spree at a Sikh temple in Wisconsin, a White House official has confirmed.
John Brennan, Obama's counterterrorism adviser, told him about the shooting.
The president is now receiving updates on the incident in suburban Milwaukee, the official said.
At least seven people have died, including a gunman, and at least three people are seriously wounded, local police and hospital officials said.
More top news
As North Korea's main trading partner, China's cooperation is critical to any efforts to derail Pyongyang's development of nuclear weapons.
Union boss says he "deeply regrets" the disruption to people's travel plans after several days of talks failed to break the deadlock.
Thousands of people downstream of a dam have been evacuated, but authorities are unable to reach many on the hurricane-hit island.