HAYWARD -- Police were called to a Hayward middle school Friday after a handful of students fell ill eating brownies, but investigators are not entirely sure what made the children sick.

Around 10:34 a.m. approximately five students attending Martin Luther King Middle School consumed brownies while at school, said Sgt. Mark Ormsby of the Hayward Police Department.

The students subsequently felt ill, Ormsby said, which prompted school officials to call Hayward police and Hayward Fire Department personnel for assistance.

None of the students were transported for medical care, and it is unknown what caused the students to become ill, according to Ormsby.

The school administrators and Hayward Police are conducting follow up investigation, he added.

Contact Katie Nelson 925-945-4780 or follow her at Twitter.com/katienelson210.