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Homeland Security Secretary John Kelly announced ramped up security measures for incoming flights to the United States Wednesday.

"Inaction is not an option," Kelly warned airlines.

"Unless we all raise our security standards, terrorists, who see commercial aviation as the greatest take-down will find and attack the weakest link."

The enhanced security includes increased scanning for explosives and increased passenger scanning.

Depending on airlines' cooperation, the measures may in the future include a wider ban on electronics for fear they contain bombs.

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"Those who choose not to cooperate or who are slow to adopt these measures could be subject to other restrictions, including a ban on electronic devices on aircraft or even a suspension of their flights into the United States," Kelly said.

However, Kelly expressed optimism that airlines will work with the U.S. to implement the precautions.

In March the U.S. restricted laptops on flights coming from 10 airports in Middle Eastern countries.

Airlines were given 21 days to comply with the new explosive screening rules and 120 days for other rules. The new rules will cost airlines, which worries some officials, Reuters reported.

The DHS intends to implement comprehensive reforms to airline security, including more intense efforts to make aircraft more secure and identify suspicious passengers.

"Today is just a starting point," he concluded.

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