Authorities in Methuen have shut down five spas suspected of human trafficking and charged a manager of one of the establishments in connection with the investigation.

Here’s an overview of what we know about the alleged brothels in the Merrimack Valley .

Which businesses have been shuttered?

To date, authorities have closed five establishments: Beauty Garden Spa on Wallace Street, Eastern Bodywork Therapy on Hampshire Street, Oriental Spa on Swan Street, and Yellow Lilly Day Spa and Lavender Spa, both at the same Baldwin Street address.

Who has been charged in connection with the spas?

So far only one person, Suping Zhu, 38, the manager of Beauty Garden Spa, has been charged criminally.

Zhu, of Flushing, N.Y., pleaded not guilty Monday in Lawrence District Court to charges of

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