(Bloomberg) -- Law enforcement at U.S. airports is inadequate to protect against the types of attacks that killed scores in Brussels and Istanbul in recent months, according to a former Transportation Security Administration official and the union representing airport screeners.

Unlike many other countries with national police forces patrolling airports, the responsibility in the U.S. falls largely on a patchwork of state and local law enforcement agencies.

“It’s a vulnerability,” John Halinski, a former deputy administrator at the TSA who is now a security consultant, said. “Airport police are really kind of overwhelmed. They just don’t have the budgets, they don’t have the manpower.”

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