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Joseph Martin

MARTINEZ -- A Concord elementary schoolteacher was charged Tuesday with 91 felonies alleging he sexually abused 11 of his former students between 2006 and this past spring.

Woodside Elementary School teacher Joseph Andrew Martin, 45, of Martinez, is being jailed in lieu of $10 million bail and is scheduled to be arraigned in Contra Costa Superior Court on Wednesday morning, a prosecutor said.

The charges, 81 counts of lewd and lascivious acts with a child under age 14 and two counts of the same charge with a child age 14 or 15, carry a multiple victim enhancement that calls for a life prison term. Martin teaches fourth and fifth grade at the school.

Concord police said they arrested Martin at his Martinez residence on Thursday following an eight-week investigation.

The investigation was sparked by an April 25 report from school administrators who alleged that Martin had inappropriately touched a student, police said.

Martin was placed on administrative leave that same day and has not returned to campus, according to the Mount Diablo Unified School District.

Martin has worked for the school district since 1991.

Lt. Steve Dyer said the victims were all Martin's students at one time and their ages range from 11 to 17. Authorities have not revealed whether the children whom Martin is accused of molesting are boys, girls or both.

Police believe that most of the molestations occurred on the Woodside Elementary School campus.

Search warrants executed at Martin's Martinez home and his Concord classroom had not been returned to the Contra Costa Superior Court on Tuesday.

The Concord Police Department has set up a hotline to solicit calls regarding any other potential victims: 925-603-5836.

Contact Malaika Fraley at 925-234-1684. Follow her at Twitter.com/malaikafraley.