Security cameras installed at House Speaker Nancy Pelosis home in San Francisco captured the break-in before her husband was attacked by a man with a hammer last week, but U.S. Capitol Police officers werent actively monitoring them at the time.

While the Speaker was with her security detail in Washington, D.C., the San Francisco cameras were not actively monitored as they are when the Speaker is at the residence, USCP confirmed in a statement Wednesday. The Command Center personnel noticed the police activity on the screen and used the feeds to monitor the response and assist investigators.

USCP also said the department will conduct an internal investigation to review its security practices.

The Washington Post first reported Tuesday that the cameras were unattended.

The news raises additional questions about how someone was able to break into the Democratic leaders home Friday and attack Paul Pelosi, who remains hospitalized after surgery for his injuries. But it also reflects the ongoing difficulties the Capitol Police and local law enforcement have in protecting members of Congress amid a surge in violent threats.

As the House speaker and a near-constant target of conservative ire, Pelosi receives more violent death threats than any other member of Congress. But the total number of recorded threats against lawmakers has surged more than tenfold in the five years since Donald Trump was elected president.

The Capitol Police monitor about 1,800 cameras each day, most at the Capitol complex in Washington but some at other points in the country. The Post notes the agency installed cameras at Pelosis home eight years ago and that she has a round-the-clock security detail. But she left her home in San Francisco last week, and most of the security detail left with her. The cameras were also not being monitored full time while she was in Washington.

David DePape is accused of breaking into Pelosis home seeking to kidnap the speaker and break her kneecaps , according to The Associated Press. The Post, citing current and former law enforcement officials, said officers monitoring the Capitol Police feeds early Friday only noticed there was an issue when they saw police lights flashing on the feeds from Pelosis home.

Paul Pelosi called 911 after the break-in, and police arrived while he was being attacked.