PORTLAND -- A number of Facebook users have changed their profile photos to The Thin Blue Line as a show of respect for a fallen Oregon City reserve police officer.

Robert Libke, 41, was responding to a house fire when he was gunned down by a man at the home.

Similar tributes appear periodically on Facebook to honor other tragedies, noteworthy among them the Boston Marathon bombing.

The blue line is a reference to police forces and the ongoing cultural tension between the civility and chaos that they enforce.

You hear often about the thin blue line, said Neil Hennelly with the West Linn Police Department. This is what the thin blue line is. We rally as family and do what we can to help other people.

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