Darien High School had a delayed opening Thursday due to a possible bomb threat.The 90-minute delay occurred after Darien police say they were notified by Purdue University in Indiana that a bomb threat may have been called into the school. Authorities say they conducted an investigation and found that the school is secure and that no threat was called in. Police say they will be at the school for the remainder of the day.For more on the bomb threat, go to channel 612 on your iO digital cable box and select iO Extra.