A woman was shot and killed after opening fire in Joel Osteen's megachurch, while a boy was also injured in the incident.

On Sunday, a woman in a trenchcoat opened fire with a long gun inside Joel Osteen's megachurch in Texas, injuring two people, including a 5-year-old boy who was in critical condition. Two off-duty officers confronted and killed the shooter.

Just before the 2 p.m. Spanish service at the Houston church, a woman with a boy entered the 16,000-person capacity building, which was previously an NBA arena. A man in his 50s was also injured in the ensuing shootout with police.

The woman's identity and motive for the shooting of the boy and man are still unknown, as well as their relationship, if any.

Houston Police Chief Troy Finner stated during a news conference outside the church that the female suspect endangered the baby and he would hold her accountable.

At a children's hospital, the boy was in critical condition, while the man, who had a hip wound, was stable at a different hospital.

The shooting at the 12:30 p.m. service at the 45,000-attendee megachurch in the U.S. could have resulted in more casualties if it had occurred during the earlier, larger 11 a.m. service, according to Osteen.

According to reports, multiple gunshots were heard by witnesses, including Christina Rodriguez, who was inside the church. Rodriguez, who was inside the church, started screaming, “There’s a shooter, there’s a shooter,” and then she and others ran to the backside of a library inside the building, stood in a stairway, and were eventually told it was safe to leave.

Alan Guity, a longtime church member whose family is from Honduras, was resting in the sanctuary before the Spanish service when he heard gunshots while his mother was working as an usher.

He exclaimed, "Mom!" as he heard four booms in quick succession, according to The Associated Press.

Guity and his mother prayed on the floor for five minutes until they were told it was safe to evacuate. Outside, they tried to calm people down by worshiping and singing in Spanish, “Move in me, move in me. Touch my mind and my heart. Move within me Holy Spirit.”

Finner commended the two security officers for their quick actions during the church shooting on Sunday, stating that the tragedy could have been much worse if they had not "engaged" the woman when she opened fire.

The Houston Police Department and Texas Alcoholic Beverage Commission officers have been placed on administrative duty due to protocol.

The woman claimed to have a bomb after being shot, but police found no explosives in her vehicle or backpack. First responders searched the megachurch for hours.

Osteen stated on Sunday that his congregation was "devastated" by the shooting. He also mentioned that he would pray for the victims, the shooter, and their families. It was unclear where he was during the shooting.

"We will remain strong and continue to move forward, despite the presence of evil forces. The stronger forces of God will guide us in our mission to uplift people and bring hope to the world," he stated during the news conference with police.

The governor of Texas, Greg Abbott, issued a statement expressing sympathy for those affected by the shooting and the entire Lakewood Church community in Houston. He stated that places of worship are sacred.

Over the past 25 years, the church has experienced significant growth since Joel Osteen took over after his father's death in 1999 and introduced a more upbeat style of Christian televangelism. His sermons are now televised and reach millions of viewers in about 100 countries. The church was founded by the elder Osteen in a converted feed store in 1959.