'Free Palestine' written on gun in shooting at Lakewood Church, but motive a mystery: Sources

A pro-Palestinian message was written on the gun belonging to a woman who opened fire at celebrity pastor Joel Osteen's Lakewood Church in Houston.

"Free Palestine" was written on the gun belonging to a woman who opened fire at celebrity pastor Joel Osteen's Lakewood Church in Houston, according to a law enforcement official briefed on the investigation.

However, a motive behind the Sunday afternoon shooting has not been determined. Sources said investigators are feverishly going through the social media and writings belonging to the suspect, described as a woman between 30 and 35 years old.

Detectives believe the suspect fired as many as 12 shots, according to a law enforcement official briefed on the investigation.

When the shooter entered the church, she was accompanied by a child aged 4 or 5, Houston police chief Troy Finner said.