PHOTO: Protesters carry roses as they march in Ferguson, Mo. on Tuesday, Aug. 19, 2014. Ferguson's leaders urged residents Tuesday to stay home after dark to "allow peace to settle in" and pledged several actions to reconnect with the predominantly black community in the St. Louis suburb where the fatal shooting of 18-year-old Michael Brown by a white police officer has sparked clashes between protesters and police. (AP Photo/Charlie Riedel)

UPDATE: 

U.S. Attorney General Eric Holder is meeting with college students as part of his trip to Missouri stemming from a white police officer's fatal shooting of an unarmed black 18-year-old.

Holder made his first stop Wednesday at the Florissant campus of St. Louis Community College, a few miles from the suburb of Ferguson where Michael Brown was shot Aug. 9.

Student Kiyanda Welch says Holder talked to students about the unrest and their own interaction with police. Holder told the group "change is coming," Welch said.

Holder also was expected to meet with FBI agents and others involved in the independent federal investigation into Brown's death.

A group of protesters gathered outside a building where a grand jury could begin a hearing to determine whether to charge the officer.

CLAYTON, Mo. (AP) — As U.S. Attorney General Eric Holder arrived in Missouri on Wednesday, a small group of protesters gathered outside the building where a grand jury could begin hearing evidence to determine whether a Ferguson police officer who shot 18-year-old Michael Brown should be charged in his death.

Outside the St. Louis County Justice Center in Clayton, where the grand jury was expected to convene, two dozen protesters gathered in a circle for a prayer, chanted, and held signs urging prosecutor Bob McCulloch to step aside. Nearly two dozen officers guarded the building's main entrance, which also was blocked off with yellow police tape.

McCulloch's deep family connections to police have been cited by some black leaders who question his ability to be impartial in the case of Darren Wilson — the white officer who fatally shot the unarmed Brown on Aug. 9. McCulloch's father, mother, brother, uncle and cousin all worked for the St. Louis Police Department, and his father was killed while responding to a call involving a black suspect.

The prosecutor, who is white, has insisted his background will have no bearing on the handling of the Brown case, which has touched off days of rancorous nighttime protests during which authorities used tear gas and rubber bullets to clear the streets of the St. Louis suburb where he was killed.

The protests were more subdued Tuesday night, with smaller crowds, fewer confrontations and no tear gas. Police said they still made 47 arrests, but mainly of people who defied orders to disperse. Tensions rose briefly when someone hurled a bottle at officers, but there were no reports gunfire or the clashes that had marked previous nights.

PHOTO: Police begin arresting dozens of protesters on West Florissant Avenue after they refused to leave the area and some began throwing objects at officers in Ferguson, Mo. early Wednesday, Aug. 20, 2014. On Aug. 9, 2014, a white police officer fatally shot Michael Brown, an unarmed black 18-year old, in the St. Louis suburb. (AP Photo/Atlanta Journal-Constitution, Curtis Compton)

The slight easing of tensions preceded the visit during which Holder was expected to meet with FBI and other officials carrying out an independent federal investigation into Brown's death, as well as with community leaders. Holder arrived in St. Louis shortly before 11 a.m. CST Wednesday, along with several Justice Department officials including members of its Civil Rights division.

In a letter published late Tuesday on the St. Louis Post-Dispatch website, Holder promised a thorough investigation while calling for an end to the violence in Ferguson. He said the bond of trust between law enforcement and the public is "all-important" but also "fragile."

Arrest patterns "must not lead to disparate treatment under the law, even if such treatment is unintended. And police forces should reflect the diversity of the communities they serve," Holder wrote.

He said the Justice Department would "defend the right of protesters to peacefully demonstrate and for the media to cover a story that must be told."

The department has mounted an unusually swift and aggressive response to Brown's death, from conducting an independent autopsy to sending dozens of FBI agents to Ferguson in search of witnesses to the shooting.

As for the county grand jury, prosecutor's spokesman Ed Magee said Wednesday that there is no timeline for how long the process could take, but it could be weeks.

A day earlier, Missouri Gov. Jay Nixon said he would not seek McCulloch's removal from the case, citing the "well-established process" by which prosecutors can recuse themselves from pending investigations to make way for a special prosecutor.

Departing from that process, Nixon said in a statement, "could unnecessarily inject legal uncertainty into this matter and potentially jeopardize the prosecution."

McCulloch, a Democrat, was elected in 1991 and has earned a reputation for being tough on crime.

Ferguson city leaders said the mayor, the City Council and municipal employees have been exploring ways to increase the number of African-American applicants to the law enforcement academy, develop incentive programs to encourage city residency for police officers and raise money for cameras that would be attached to patrol car dashboards and officers' vests.

"We plan to learn from this tragedy, as we further provide for the safety of our residents and businesses and progress our community through reconciliation and healing," officials said in a public statement.

Meanwhile, Brown's funeral arrangements were set. The Austin A. Layne Mortuary, which is handling arrangements, said the funeral will be at 10 a.m. Monday at Friendly Temple Missionary Baptist Church. Brown's uncle, the Rev. Charles Ewing, will deliver the eulogy, and the Rev. Al Sharpton will also speak.

Brown will be buried at St. Peter's Cemetery in St. Louis County.

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Associated Press writers Jim Suhr in Clayton, Alan Scher Zagier in Ferguson, Jim Salter in St. Louis and David A. Lieb in Jefferson City contributed to this report.