Classes were back in session today at Emily Dickinson Elementary School and Explorer Community School following yesterday’s bottle-bomb explosion in the Dickinson parking lot before school. One bus driver was injured when the two-liter, soda-bottle bomb exploded.

The King County Sheriff’s public information officer’s Twitter account stated, “Bomb deputies clear scene. Device was an acid bomb, commonly made by juveniles. It wasn’t a sophisticated device.”

Kathryn Reith, communications director for the Lake Washington School District (LWSD), said the bus driver (who is not being named for privacy reasons) was released from the hospital yesterday with no serious injuries.

Reith added that a counselor was on campus today in case students wanted to discuss yesterday’s incident.

The two elementary schools were closed Monday for police activity as members of the King County Sheriff’s Office performed a sweep of the campus for additional devices. In addition, nearby Evergreen Middle School (EMS) was on modified lockdown with classes as scheduled, though students stayed inside the building.

Sgt. DB Gates with the sheriff’s office said their sweep of both the elementary schools and middle school campus came up clean.

“There was nothing,” she said regarding additional devices.

Reith said the sweep was complete by about 11 a.m.

There is an investigation underway, but Gates didn’t have any updates on the situation today.