Weaknesses in the US technology infrastructure remains one of the greatest threats to national security, the US House Committee on Homeland Security has heard.
Arizona representative Ann Kirkpatrick warned that computer systems which increasingly oversee critical national infrastructure are continually under attack.
"These systems are attacked every single day. The fact is, one of these systems is likely being attacked right now," she said.
Kirkpatrick urged the White House and Congress give this threat the attention it requires.
She said despite president Barack Obama stating that securing US networks was a priority shortly after coming to office, there is still no cybersecurity coordinator in the White House.
"We must regain focus, fill these vacant high-level positions and implement a plan to secure our networks before an attack does irreparable harm to our Nation," she said.