Officials from the U.S. Department of Justice Thursday morning are expected to announce the federal agency’s findings from a more than 14-month-long investigation into Portland police use of force.

The federal agency opened a civil rights investigation June 28, 2011, to determine whether the Portland Police Bureau engages in a “pattern or practice’’ of excessive force, particularly against people with mental illness.

Assistant U.S. Attorney General Thomas E. Perez came to Portland last June to announce the federal inquiry. He said then that the review was prompted by a significant increase in police shootings during the prior 18 months, the majority involving people with mental illness.

Perez is back in town Thursday, set to announce the findings with U.S. Attorney Amanda Marshall, Mayor Sam Adams and Mike Reese, chief of police, at 10:30 a.m. at the Justice Center, located at 1111 Southwest 2nd Avenue, in Room 14B.

Lt. Robert King, a police spokesman, declined to comment on the nature of the morning's announcement.

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The police investigation was to overlap with an ongoing federal investigation into Oregon’s mental health care system, federal officials said.

Special litigation attorneys in the Justice Department’s Civil Rights Division, along with the U.S. Attorney’s Office, have been evaluating bureau policies, procedures and practices, as well as specific officer-involved fatal shootings or deaths in custody.

In February, federal authorities held their first public forum in Portland’s St. Johns neighborhood to hear citizens’ accounts of their interactions with Portland police officers. And in August 2011, Justice Department officials held individual interviews with community groups.

If violations are identified, the federal agency will recommend remedies and may monitor the Police Bureau until it’s satisfied the bureau has addressed the problems.

Since the inquiry began, Chief Mike Reese has made some changes in response to federal recommendations. He began to require sergeants immediately initiate investigations into officers’ use of force and assigned a new inspector to analyze data on such incidents, a gap identified by the Justice Department during the course of the inquiry. Just last week, the Portland police released its own 4-page statistical report on police use of force, showing a 35 percent decline between 2008 and 2011.

Earlier this year, Reese defended his officers’ use of force. He cited increasing calls involving suicidal people and decried the faltering safety net for those with mental illness.

Portland joined a growing number of police agencies, including Seattle, Newark, N.J. and New Orleans, that have been targeted for federal review in the last few years, under a 1994 law passed by Congress after the brutal beating of Rodney King by Los Angeles police officers.

In Seattle, the federal agency announced this summer that a court-appointed monitor was to ensure that Seattle Police revise its use of force policies, and enhance its training, reporting, investigations and supervision of police use of force. The Justice Department found that Seattle police engaged in a “pattern or practice of excessive force,’’ but did not find a practice of discriminatory policing.

The federal inquiry in Portland – the first comprehensive federal investigation into the city’s police bureau- followed a string of controversial Portland officer-involved fatal shootings or deaths in police custody of people suffering from mental illness.

In February 2010, city officials, including former police Commissioner Dan Saltzman and Mayor Sam Adams, had asked the U.S. Justice Department to conduct a full review of the Police Bureau after the Jan. 29, 2010 police fatal shooting of Campbell, an unarmed black man who was distraught following the death of his brother earlier that day.

Community leaders disturbed by the high-profile police shootings and deaths in custody also pressed for such an inquiry.

Among their concerns: the high profile September 2006 death in police custody of James P. Chasse Jr., a 42-year-old man who suffered from paranoid schizophrenia; the fatal shooting of a 58-year-old homeless man Jack Dale Collins who emerged from a restroom at Hoyt Arboretum with an X-Acto knife; and the shooting of homeless veteran Thomas Higginbotham, who was shot 10 times after he emerged from a Southeast Portland car wash with a knife.

-- Maxine Bernstein Follow ‏@maxoregonian