People came to pray in front of UMC Sunday and to leave flowers, candles and signs.

Tucsonans flocked to places of worship on Sunday to mourn those lost in Saturday's shooting, and pray for the recovery of the injured.

The faithful crammed the synagogue, Congregation Chaverim, where U.S. Rep. Gabrielle Giffords is a member, as well as at the Mountain Avenue Church of Christ, which lost one member in the attack and saw another one wounded.

"I don't know how to grieve. This morning I don't have the magic pill, I don't have the Scripture... I can't wrap my head around this," said the church's Rev. Mike Nowak, his strong preacher's voice wavering.

Nowak said he received hundreds of e-mails from people sharing their prayers with the congregation.

Other services are planned for this week, including:

• President Obama has called for a national moment of silence at 9 a.m. today to remember the victims of the shooting.

• The northwest Safeway, Tucson Medical Center and the YWCA are offering community stress debriefings today.

Counselors will be available from 10 a.m. to 6 p.m., with group sessions at 10 a.m., noon, 2 p.m. and 4 p.m., at El Dorado Healthy Living Connection, 1400 N. Wilmot Road; and the YWCA of Tucson, conference center, 525 N. Bonita Ave.

Sessions at TMC, 5301 E. Grant Road, in the Marshall Conference Center, are scheduled for 9 a.m. to 11 a.m., 2 p.m. to 4 p.m. and 6 p.m. to 8 p.m.

• The Roman Catholic Diocese of Tucson will hold a Mass on Tuesday to remember the victims and help heal the community.

The Mass will be celebrated at 7 p.m. at St. Odilia Catholic Church, 7570 N. Paseo del Norte.

Two of the six people killed in the shootings were members of local Catholic parishes.

Christina-Taylor Green, 9, made her First Communion at St. Odilia last spring and sang in the children's choir.

U.S. District Judge John Roll, the chief federal judge for Arizona, served as a lector at St. Thomas the Apostle.

• The Southern Arizona Roadrunners and Meet Me at Maynards will remember the victims at their regularly scheduled run/walk today.

Attendees are encouraged to bring candles, lights and friends.

Tucson Medical Center will provide a community debriefing, with a focus on coping, afterward at Hotel Congress.

For more information, check ww.meetmeat

•A Bike Vigil is scheduled for 7 p.m. Tuesday.

Cyclists will meet on the west side of Old Main on the University of Arizona campus at 6:50 p.m. for a ride around campus with a stop at University Medical Center to light candles, and return to Old Main at 8:30 p.m.