A Muslim family in Malverne discovered hate messages in their mailbox, prompting investigators to search for the culprits, Nassau police said Tuesday.

When the victims, who live on Norwood Avenue, went to their mailbox at about 4 p.m. Monday, they found a note, written on paper in red ink that read: “KKK Hate Muslims. We will kill you. Jesus loves you,” police said.

Police said a second note on a paper plate, also written in red ink, declared: “The KKK is coming for you Muslims.”

“We take these very, very seriously. It’s never a joke when it comes to a bias incident,” said Det. Vincent Garcia, a police spokesman.

Bias incidents are up this year, with 29 reported in Nassau through June. There were 21 incidents reported during the same period last year.

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The New York chapter of the Council on American-Islamic Relations condemned the incident.

“This is evidence of the ongoing and increasing number of hate incidents targeting the Muslim community in New York and nationwide,” said executive director Afaf Nasher. “It is an obligation of our government to ensure that everyone in our community is free to practice their faith without intimidation. We are glad to see that authorities are pursuing this incident as a hate crime and hope that the perpetrator is caught and brought to justice.”

Anyone with information is asked to call Crime Stoppers at 800-244-TIPS.