April 26, 2016 9:12 PM EDT

Police are still searching for answers as they investigate the killing of a married California couple found dead in their San Jose home on Sunday, next to a message that read, “Sorry, my first kill was clumsy.”

Investigators said Tuesday that the suspect is someone familiar to the family and they do not believe the killings were random, the San Jose Mercury News reported. Relatives reported the note, according to the paper.

Golam Rabbi, 59, and Shamima Rabbi, 57, were found dead on Sunday by relatives who had been unable to reach them for several days, according to the Mercury News. The Rabbis, who were both shot, worship at a local Islamic center, but police said they don’t believe the couple was targeted because of religion.

“Based on the information we have at this time, we do not believe this incident is a hate crime or that the public is in any immediate danger as a result of the suspect’s actions,” police said, according to the newspaper.

The couple has two sons who live at home. The 17-year-old son has been interviewed by investigators and is not a suspect in the case, but police have not been able to reach the older son, the Mercury News reported.

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Write to Katie Reilly at Katie.Reilly@time.com.

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