FORT HOOD, Texas (AP) — Mourners were asked to pray for the man authorities say went on a shooting spree at Fort Hood, and an Army chaplain exhorted his congregation on Sunday to draw together even if the gunman's motives may never be fully known.

"Lord, all those around us search for motive, search for meaning, search for something, someone to blame. That is so frustrating," Col. Frank Jackson told a group of about 120 people gathered at the post's chapel. "Today, we pause to hear from you. So Lord, as we pray together, we focus on things we know."

Worshippers hugged each other and raised their hands in prayer during the service, in which Jackson asked the congregation to pray for the 13 dead and 29 wounded that Maj. Nidal Malik Hasan is accused of shooting. The chaplain also urged the crowd to pray for Hasan and his family "as they find themselves in a position that no person ever desires to be."

"And Lord, teach us to love and pray for those who rise up against us and pray for those who do us harm. We pray for Maj. Hasan. Asking that you do the work that only you can do in his life," Jackson said.

Across the sprawling post and in neighboring Killeen, soldiers, their relatives and members of the community struggled to make sense of the shootings. Candles burned Saturday night outside the apartment complex where Hasan lived. Small white crosses, one for each of the dead, dotted a lawn at a Killeen church on Sunday.

At least 16 victims remained hospitalized with gunshot wounds, and seven were in intensive care.

Even as the community took time to mourn the victims at worship services on and off the post, Col. John Rossi acknowledged that the country's largest military installation was moving forward with its usual business of soldiering. The processing center where Hasan allegedly opened fire on Thursday remains a crime scene, but the activities that went on there were relocated, with the goal of reopening the center as soon as Sunday.

Fort Hood is "continuing to prepare for the mission at hand," Rossi said. "There's a lot of routine activity still happening. You'll hear cannon fire and artillery fire. Soldiers in units are still trying to execute the missions we have been tasked with."

But the specter of the shooting lingers on the post. Rossi acknowledged that psychic wounds could be deep.

"The piece that most are troubled with right now is the location of where it happened and how it could happen," he said. "We know that problems sometimes take a while to manifest themselves in an individual and might come up in a later time period."