At least six people were shot Thursday afternoon at Seattle Pacific University in Seattle and police have at least one person in custody.

The shooting happened about 3:30 p.m. in Otto Miller Hall, 3rd Avenue West and West Nickerson Street. The campus was on lockdown and traffic around the school was blocked.

Police initially said there was a second suspect in custody, but later said there was only one. KIRO 7 reporter Gary Horcher also was told a second person was arrested.

Police said they were looking for a white man with a long-sleeved blue shirt with long vertical stripes. Police said he's armed with a handgun.

Medic units lined up multiple stretchers outside the school. The university posted online that "the campus is in lockdown due to a shooting at Otto Miller Hall." The hall has math and science classes.

A woman who answered the phone at the school's security office quickly disconnected, saying no one could talk. FBI agents also were responding.