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The U.S. Department of Homeland Security is investigating about two dozen cases of suspected cybersecurity flaws in medical devices and hospital equipment that officials fear could be exploited by hackers, a senior official at the agency told Reuters. The products under review by the agency's Industrial Control Systems Cyber Emergency Response Team, or ICS-CERT, include an infusion pump from Hospira Inc and implantable heart devices from Medtronic Inc and St Jude Medical Inc, according to other people familiar with the cases, who asked not to be identified because the probes are confidential. These people said they do not know of any instances of hackers attacking patients through these devices, so the cyber threat should not be overstated. Still, the agency is concerned that malicious actors may try to gain control of the devices remotely and create problems, such as instructing an infusion pump to overdose a patient with drugs, or forcing a heart implant to deliver a deadly jolt of electricity, the sources said.