Defiant protesters occupying the Portland headquarters of Immigration and Customs Enforcement remain encamped Wednesday morning for the 11th day despite another warning from federal officials that arrests could come at any time.

A sea of tents remained outside of the headquarters on Southwest Macadam Avenue, and protesters spent a tense night after a second round of fliers, distributed by Federal Protective Services officers on Monday and Tuesday, warned those who remain could face arrest and federal prosecution.

Occupiers, the first of whom arrived on Sunday, June 17, showed no sign of relenting.

"People are going to do whatever it takes," Jacob Bureros, an organizer of the Occupy ICE PDX movement, said Tuesday. "If they arrest us on federal property, we'll shut the roads down. You can't stop us. They're going to find out that this city has more resolve than they do."

The facility, which includes a temporary holding facility for immigrant detainees, was shut down by federal officials early in the protest, which has gone on for more than week. Federal officers entered the building overnight Monday, presumably sneaking past sleeping demonstrators.

About 7 p.m. Tuesday, a group of 10 protesters linked their arms together with what appeared to be PVC pipes and cord.

The display only lasted a few minutes, but Marquez Luis, a member of organizing group Direct Action Alliance, said it was meant as a "symbolic gesture" to show that occupiers do not plan to leave until the facility is shut down.

The Portland occupation has sparked similar demonstrations throughout the country, and on Tuesday evening at least 10 protesters were arrested outside the ICE headquarters in Tacoma, according to the Tacoma News Tribune.

Mayor Ted Wheeler has said city police won't interfere with the Portland occupation.

Protesters have released a list of demands, including abolishing ICE, a notion that has garnered support among some Oregon elected officials, including U.S. Rep. Earl Blumenauer, a Portland Democrat.

Asked whether occupiers plan to stay put if federal officers move to sweep the camp, Luis replied, "whether one or thousands, people will be here."

Oregonian reporters Jim Ryan and Anna Spoerre contributed to this report.

-- Kale Williams

kwilliams@oregonian.com

503-294-4048