WASHINGTON (AP) — The Latest on congressional testimony about the Jan. 6 Capitol riot (all times local): 11:46 a.m. Attorney General Merrick Garland says the Justice Department is still in the early days of its investigation of the insurrection at the Capitol on Jan. 6.

An American flag flies at half-staff in remembrance of U.S. Capitol Police Officer Brian Sicknick above the Capitol Building in Washington. May 12, 2021

Garland told the Senate Appropriations Committee that it has only been a “relatively short” period since the riot by supporters of President Donald Trump sought to overturn the results of the November election. That’s especially true, he said, because of the large number of separate investigations and huge amount of video and other data that authorities are combing through as they pursue leads in the investigation that has so far resulted in about 400 arrests.

“This investigation is not over,” Garland said. “We will pursue each lead and we’re confident that we will quickly have reached the end.” Garland and Department of Homeland Security Secretary Alejandro Mayorkas were testifying to the Senate committee about their budget needs as both agencies confront a growing threat from domestic violent extremism.

__ HERE’S WHAT YOU NEED TO KNOW ABOUT THE LATEST CONGRESSIONAL HEARING INTO THE DEADLY CAPITOL RIOT: Two senior Trump administration officials defend their actions during the Jan. 6 riot at the U.S. Capitol in testimony before Congress, with former acting Defense Secretary Christopher Miller standing behind every decision he made that day.

HERE’S WHAT ELSE IS GOING ON:

11:32 a.m.

The chief of police in the nation’s capital says investigators believe there was pre-planning involved when two pipe bombs were left at the headquarters of the Democratic and Republican national committees.

Metropolitan Police Chief Robert Contee said Wednesday that investigators also believe the explosives were “positioned out there by a lone individual.”

The two explosive devices were planted the night before the riot but only discovered on the afternoon of Jan. 6, shortly before the crowd descended on the Capitol.

The FBI has said the bombs were placed outside the two buildings between 7:30 p.m. and 8:30 p.m. on Jan. 5. It is not clear whether that means the pipe bombs were unrelated to the next day’s riot or were part of the riot planning. Both buildings are within a few blocks of the Capitol.

Contee says the investigation remains ongoing.

11 a.m.

Former acting Attorney General Jeffrey Rosen says he is “proud” of the Department of Justice’s response to the Capitol insurrection.

Rosen testified Wednesday before a House panel examining the federal response to the deadly Jan. 6 riot by supporters of former President Donald Trump.

Rosen insists the Justice Department “took appropriate precautions” ahead of the riot and put tactical teams and other elite units on standby. Rosen says Justice Department officials and federal law enforcement officials “moved with urgency” to assist the U.S. Capitol Police to clear the Capitol. The Justice Department has charged more than 400 people in connection with the riot. Trump was impeached by the House and then acquitted by the Senate.

10:55 a.m.

Former acting Defense Secretary Christopher Miller says criticism about the response from the military to the Jan. 6 Capitol insurrection “is unfounded.”

Miller testified Wednesday at a House Oversight Committee hearing about the federal government’s response to the deadly riot by supporters of former President Donald Trump.

Miller and other military officials have been criticized in the months following the riot, with congressional leaders and others questioning why it took hours for the National Guard to respond to the Capitol as the mob descended on the Capitol.

Hundreds of people broke into the building as Congress was voting to certify Joe Biden’s presidential win.

Miller says he believes the criticisms “reflect inexperience with, or a lack of understanding of, the nature of military operations.”

10:45 a.m.

House Oversight and Reform Committee Chairwoman Carolyn Maloney says Congress must find out why the federal government “failed to coordinate an effective and timely response” to the Jan. 6 siege on the Capitol by supporters of former President Donald Trump.

Maloney made the comments Wednesday as she opened a hearing with former acting Defense Secretary Christopher Miller and former acting Attorney General Jeffrey Rosen, both of whom were involved in the response.

Maloney says, “It is our duty to understand what went wrong that day, to seek accountability and to take action to prevent this from ever happening again.”

Maloney says it’s clear Trump is responsible for the Capitol riot. The House impeached Trump a week after the siege for telling his supporters that day to “fight like hell” to overturn the results of the election, which he lost to Democrat Joe Biden. The then-Republican-led Senate acquitted Trump in February.

Republicans immediately tried to change the subject of the hearing to protests in several cities over the last year in response to the death of George Floyd. The top Republican on the panel, Kentucky Rep. James Comer, says Democrats “continue to demonize tens of millions of Americans who support President Trump.”