CORAL SPRINGS, Fla. -

A teacher accused of sending explicit text messages and emails to a 14-year-old girl sent similar messages to at least three others, according to court documents.

Warren Zilka, an 8th grade teacher at Imagine Charter School, turned himself in to the Coral Springs Police Department last month. He was charged with transmitting material harmful to a minor and unlawful transmission of obscene material. 

According to a probable cause affidavit, Zilka, 43, sent messages to two other 14-year-old girls and a 15-year-old girl.

Zilka hasn't been charged in connection with the allegations brought by those three girls. The Broward State Attorney's Office says the investigation is ongoing.

School officials say Zilka was let go after his arrest.