WASHINGTON — This week’s Independence Day massacre in a Chicago suburb is highlighting the challenge now facing U.S. law enforcement and homeland security officials — an environment in which almost any public event could come under attack with few, if any, signals for authorities to detect in advance.

“There is a resistance in general, either from kind of an ideological perspective, in some cases because of historical mistrust of what the federal government has been doing,” said Sam Lichtenstein, director of analysis at the Risk Assistance Network and Exchange, also known as RANE.

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