MERRIMACK - Two Amherst men were arrested after their van rear-ended an occupied school bus Wednesday afternoon at Amherst Road and Cross Street.

No one on the school bus was injured, according to a police news release.

Police said the van, allegedly driven by Christian Benjamin, 20, of 7 Timber Chase, fled the crash scene. As officers were directing traffic after the 3:09 p.m. crash, police said the van returned.

This time, however, Jonathan Palmer, 21, of 68 Profile Circle, was in the driver's seat, police said. Benjamin allegedly switched seats with him after the accident.

Benjamin was arrested for conduct after an accident and both men were charged with one count of operating a motor vehicle while under the influence of drugs.

At the station, police said Palmer assaulted two officers, punching each twice, and was charged with four counts of simple assault. His bail was set at $25,000 cash, pending arraignment Thursday in 9th Circuit Court, Goffstown District.

Benjamin's bail was set at $1,000 cash and $5,000 personal recognizance, pending arraignment at a later date at 9th Circuit Court, Merrimack District.