The White House says President Barack Obama has no plans to visit Ferguson anytime soon.
Officials say they're mindful that security and logistics for a presidential visit could divert law enforcement resources stretched thin by several nights of demonstrations and clashes with protesters over the Michael Brown shooting.
The president is sending Attorney General Eric Holder to Ferguson Wednesday to meet with FBI and other officials carrying out an independent federal investigation into Brown's death. A grand jury could begin hearing evidence Wednesday to determine whether police officer Darren Wilson should be charged in Brown's death.
President Obama says he urged Gov. Jay Nixon to ensure the use of National Guard units is limited and constructive.
Meanwhile, St. Louis Archbishop Robert Carlson says a Mass for Peace and Justice will offer prayers for Ferguson, Missouri.
The mass is at 5 p.m. Wednesday at the Cathedral Basilica. A collection will be taken to assist food pantries and parishes in the Ferguson area, and to help those affected by looting and property destruction.