Cybersecurity

Hacks Raise Fear Over N.S.A.’s Hold on Cyberweapons

Twice in the past month, National Security Agency cyberweapons stolen from its arsenal have been turned against two very different partners of the United States — Britain and Ukraine.

The N.S.A. has kept quiet, not acknowledging its role in developing the weapons. White House officials have deflected many questions, and responded to others by arguing that the focus should be on the attackers themselves, not the manufacturer of their weapons.

But the silence is wearing thin for victims of the assaults, as a series of escalating attacks using N.S.A. cyberweapons have hit hospitals, a nuclear site and American businesses. Now there is growing concern that United States intelligence agencies have rushed to create digital weapons that they cannot keep safe from adversaries or disable once they fall into the wrong hands.