Simplify the following text for a Grade 7 native English-speaking person.
Original: The plane crashed in a field in Stonycreek Township , near Shanksville , in Somerset County , Pennsylvania , about 80 m southeast of Pittsburgh and 150 m northwest of Washington , D.C. , killing all on board including the four hijackers .
Simplified: The plane crashed in a field just outside Shanksville , Pennsylvania , about 150 m northwest of Washington , D.C. , killing all crew members and passengers .