(CNN) -- A California man was arrested on suspicion of stalking after he allegedly used his airplane to violate a restraining order by buzzing a neighborhood, police said Thursday.

In recent weeks, Concord, California, police were investigating an incident in which leaflets were dropped over a residential neighborhood, possibly by a low-flying airplane, police said in a statement.

"The leaflets referenced a specific person and contained defamatory language and racial slurs. As the investigation has progressed, it appears that the motivation behind this situation is a failed domestic relationship," the statement read.

The investigation led to the identification of a possible suspect, a 51-year-old licensed pilot. Concord police served the man with a restraining order on Wednesday, the statement said. Watch how neighbors took action »

On Wednesday evening, police received several calls from residents of the neighborhood reporting a low-flying private airplane in the area. "The plane was reported to have made eight passes over the neighborhood," the statement said.

Police officers responded to the airport and contacted the man after he landed his plane. It was the same man who had been served with the restraining order earlier in the day, police said. He was arrested on suspicion of stalking and violating a restraining order.

The man was booked into the county jail in Martinez, California, in lieu of $155,000 bail, police said.

Concord police said the investigation is ongoing.

The Federal Aviation Administration said it was not currently investigating the situation. "Our interest is in air safety," said spokesman Mike Fergus.

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