White House officials say technicians recently noticed suspicious activity on the computer systems at the U.S. presidential mansion.
They say the situation was dealt with immediately and work continues, although the response has led to temporary outages and loss of Internet connectivity for some White House employees.
Officials gave no details about who might who have been responsible or when the activity occurred.
White House computer systems are a prime target of hackers, and the president's office receives daily alerts concerning numerous possible cyberthreats.
