The pedestrians, one woman and two children, were taken to the hospital. No one on the bus was injured.
UPDATE, 3:56 p.m.
The Delaware State Police Collision Reconstruction Unit is investigating a crash in which three pedestrians were hit by a school bus this morning near Bear.
The incident occurred at about 8:22 a.m., at the intersection of U.S. 40 (Pulaski Highway) and Salem Church Road/Porter Road.
A 2016 Freightliner school bus from the Christina School District, driven by a 55-year-old Newark man, was traveling south from Salem Church Road and crossed all lanes of U.S. 40 to continue on Porter Road southbound.
The bus was proceeding with a green light and had the right of way, police said.
A 36-year-old Newark woman, a 9-year-old girl and 6-year-old boy were attempting to cross Porter Road without the right of way, and walked into the path of the school bus, police said.
Despite braking, the bus driver could not avoid striking the three pedestrians, knocking them all to the pavement.
The woman was flown by a Delaware State Police helicopter to the Christiana Hospital with serious injuries. The girl and boy had non-life threatening injuries and were taken by emergency medical services to A.I. du Pont Hospital for Children.
The driver of the school bus, along with a bus aide who was a passenger, were not injured.
There were no students on the bus.
The investigation is continuing. Anyone with information is asked to contact Cpl. Aube at 302-365-8483. Information may also be provided by calling Delaware Crime Stoppers at 1-800-TIP-3333 or online at http://www.delaware.crimestoppersweb.com.
ORIGINAL REPORT, 9:09 a.m.
Delaware State Police are at the scene of a crash involving a school bus on U.S. Route 40 (Pulaski Highway) near Salem Church Road.
All eastbound lanes of U.S. Route 40 are closed at this time, said Master Cpl. Michael Austin in a report at 8:55 a.m.
No report about injuries is available yet, Austin said. More information will be released as it becomes available.
Drivers can expect delays in the area and are asked to seek alternate routes of travel.
For updated traffic conditions and road closure information, see http://www.deldot.gov/Traffic/travel_advisory/index.shtml#advisories.