The claim that 'blue cities' are directing police to detain any mask-wearing ICE agents immediately and arrest those without visible ICE identification is false because no credible or official sources report such directives or policies, and available evidence shows masked ICE agents operate with federal authorization despite local opposition but are not subject to arrest by local police on this basis.
Blue cities are reportedly directing police to begin detaining any mask-wearing ICE agents immediately, and, if they have no identification as ICE visible, they'll be arrested.

Blue state declares war on Trump's masked immigration agents - Raw Story
Source: rawstory.com
Key Evidence
Multiple reputable sources confirm ICE agents wear masks during operations but do not report local police detaining or arresting them for this reason.
lawblogs.uc.edulawblogs.uc.eduMasked and Unidentifiable: How ICE Tactics Create a Public Safety Crisis for...
theguardian.comtheguardian.comIce chief says he will continue to allow agents to wear masks during arrest...+1 more
A state law cited in penalizes masked officers committing offenses but does not authorize arrest of ICE agents solely for mask-wearing.
rawstory.comrawstory.comBlue state declares war on Trump's masked immigration agents
News coverage of ICE activity in various cities shows cooperation or tension with local authorities but no evidence of police detaining masked ICE agents as claimed.
mprnews.orgmprnews.orgICE agents tackle, arrest American citizen in Minneapolis
theguardian.comtheguardian.comUS citizen chased by federal agents in New Orleans says she was targeted because...+1 more
What the Evidence Shows
The claim involves two key assertions: first, that certain 'blue cities' (typically Democratic-leaning municipalities) have issued orders for local police to detain any ICE agents wearing masks; second, that ICE agents without visible identification would be arrested. Reviewing the provided sources reveals no evidence supporting these assertions. Several sources discuss the controversial practice of ICE agents wearing masks during arrests, highlighting concerns about accountability and public trust. However, none mention local police being instructed to detain or arrest these agents.lawblogs.uc.edulawblogs.uc.eduMasked and Unidentifiable: How ICE Tactics Create a Public Safety Crisis for...
theguardian.comtheguardian.comIce chief says he will continue to allow agents to wear masks during arrest...+3 more references a 'blue state' law imposing penalties on masked officers committing offenses but does not indicate police are detaining or arresting ICE agents solely for mask-wearing or lack of visible ID. Instead, it focuses on civil liability and penalties for misconduct.
Other sources explain the reliance of ICE on local law enforcement cooperation but do not describe any hostile directives from local police departments against ICE agents.prisonpolicy.orgprisonpolicy.orgNew ICE arrest data show the power of state and local governments to curtail...
News reports document specific incidents involving ICE arrests and interactions with citizens but do not support claims of local police detaining ICE agents for mask use or ID issues.mprnews.orgmprnews.orgICE agents tackle, arrest American citizen in Minneapolis
theguardian.comtheguardian.comUS citizen chased by federal agents in New Orleans says she was targeted because...+1 more
Overall, the claim appears to be a misrepresentation or fabrication without basis in official policies or credible reporting. Masked ICE operations are controversial but remain federally authorized, and local police do not have standing orders to arrest ICE agents on these grounds.