Updated

Four San Diego County bus drivers may have fallen ill from eating drug-laced goodies provided by a fellow worker.

The Metropolitan Transit System drivers were on their routes Sunday when they felt dizzy and had to pull over, MTI officials said. Replacements were brought in.

It was unclear how many passengers were aboard the buses.

"The source of the illness has been traced back to baked goods distributed by one fellow employee," MTS Chief Executive Officer Paul Jablonski said in a memo sent Wednesday to MTS board members, KGTV-TV (bit.ly/OswVXt) reported.

The memo did not indicate what might have been in the goodies but said the drivers were placed on leave pending drug testing.

A fifth worker also was placed on paid leave, officials said.

A call to MTS spokesman Rob Schupp seeking comment was not immediately returned Thursday.

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Information from: KGTV-TV, http://www.10news.com/index.html