Story highlights Hillary Clinton says the United States must increase its surveillance to avert Brussels-style attacks on unprotected "soft" targets

"We have to toughen our surveillance, our interception of communication," Clinton said

Washington (CNN) Hillary Clinton says the United States must increase its surveillance to avert Brussels-style attacks on unprotected "soft" targets.

"We have to toughen our surveillance, our interception of communication," the former secretary of state and Democratic presidential contender said Tuesday in an interview with CNN's Wolf Blitzer.

Clinton continued: "We have to also toughen, as you say, 'soft targets,' with greater police presence -- there is no getting around that."

Her comments come in the wake of the latest strike on European soil for which ISIS has claimed responsibility. At least 30 people were killed in the attacks in Belgium's capital.

Clinton said terrorists are "getting more sophisticated" in their construction of explosives to escape detection.

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