Cybersecurity teams worked to contain the intrusion. The FBI, the Secret Service, and the National Security Agency are also investigating the intrusion which is supposed to be made by some people working for the Russian government. Previously, recent reports by security firms have identified many other cyberespionage campaigns by Russian hackers. “The temporary outages and loss of connectivity for our users is solely the result of measures we have taken to defend our networks,” a White House official said. “Any such activity is something we take very seriously. In this case, we took immediate measures to evaluate and mitigate the activity,” he added. However, this was a serious warning to increase the security of computer networks at the White House. For the instant, no other information was available.