Police say the first incident was reported on Feb. 28 by the owner of an Indian restaurant after eggs were thrown at his house and animal bones were left at his door.
The owners of a taxi company and second Indian restaurant stepped forward on Sunday and Monday after learning about the first email from media reports, and said they too had received similar emails.
All three emails were sent from the same anonymous address.
RCMP Cpl. Tammy Hollingsworth said that after the first incident was reported an investigator responded to the email and received an anonymous apology.
She said the sender said he or she was having a bad day and dealing with mental health issues.
"We want to speak to the person who wrote these emails and want them to come forward. It's easy enough just to send an apology to somebody, but without a name or a person behind it, it really doesn't mean much," Hollingsworth said.
She said police have not discounted that the incidents might be motivated by hate.
"We are certainly looking at all aspects of the investigation in order to better determine what the motivation is."
The B.C. Hate Crimes Unit is also investigating.
"This isn't something that our community wants to be known for and it's certainly not a reflection of what we see in Chilliwack on a regular basis," Hollingsworth said.
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