President Obama — under increasing fire for frolicking on Martha’s Vineyard in the middle of national and international crises — flew back to DC for a hastily arranged press conference Monday.

While the president previously planned to head back to DC, now he will spend two days huddling with advisers over the fatal shooting of Michael Brown, an unarmed black teen, by a white cop in the St. Louis suburb of Ferguson, Mo.

He told reporters he had already ordered US Attorney General Eric Holder to fly to Ferguson to personally oversee the investigation into Brown’s death.

“[Holder] will also be meeting with other leaders in the community whose support is so critical to bringing about peace and calm in Ferguson,” the president said.

While a “vast majority” of people are protesting peacefully, a “small minority” are acting criminally, Obama said.

“While I understand the passions and the anger that arise over the death of Michael Brown, giving in to that anger by looting or carrying guns and even attacking the police only serves to raise tensions and stir chaos. It undermines rather than advancing justice,” Obama said.

“In order to truly begin the process of healing, we must also see an end to the acts of violence in the streets of Ferguson,” Holder said.

“Those who have been peacefully demonstrating should join with law enforcement in condemning the actions of looters and others seeking to enflame tensions.”

Obama also addressed criticism of local police departments using grant money to buy military equipment, saying, “There is a big difference between our military and our local law enforcement and we don’t want those lines blurred. That would be contrary to our traditions.”

Holder said the Justice Department is putting its full resources into its investigation into Brown’s death.

“During the day today, more than 40 FBI agents continued their canvassing of the neighborhood where Michael Brown was shot,” Holder said in a statement Monday.

“As a result of this investigative work, several new interviews have already been conducted.”

Holder criticized the “selective release” of sensitive information in the case.

Over the weekend, the Ferguson Police Department said Brown was a robbery suspect when he was stopped by the cop who killed him, although the officer didn’t know that at the time.

“The selective release of sensitive information that we have seen in this case so far is troubling to me,” Holder said.

“No matter how others pursue their own separate inquiries, the Justice Department is resolved to preserve the integrity of its investigation,’’ Holder said.