Boston Metro reports [2] the action comes a day after Massachusetts ordered most of the line's buses off the road.
Links:
[1] http://www.universalhub.com/users/adamg
[2] http://www.metro.us/boston/news/2013/02/26/feds-order-fung-wah-to-halt-bus-service/
[3] http://www.bostonglobe.com/business/2013/02/26/orders-fung-wah-bus-line-suspend-passenger-service-over-safety-concerns/qmpsnTKMDtEfw7NQTc8QiN/picture.html
[4] http://www.universalhub.com/taxonomy/term/24
[5] http://www.universalhub.com/taxonomy/term/410