A 42-year-old man was charged on Monday in connection with a fire that was set at a Planned Parenthood clinic in Columbia, Mo., last month.

The man, Wesley Brian Kaster, was arrested Saturday, about three weeks after the authorities began investigating what they called a suspicious fire at the clinic on Feb. 10.

Don Ledford, a spokesman for the United States Attorney’s office, declined to elaborate on a possible motive. “It’s early in the case,” he said. “It’s still an ongoing investigation.”

In court papers, prosecutors noted that Mr. Kaster’s wife had posted a picture on Facebook in 2015 showing a handgun and the caption, “Guns Don’t Kill People, Planned Parenthood Kills People.”

Read more: New York Times