Transportation safety board officials are around site and an investigation is underway.

运输安全局官员已抵达事故现场，正在进行事故调查。

Tjibbe Joustra is the safety board's chairman. He said progress has been made since the downing of flight MH17.

朱斯特拉（Tjibbe Joustra）是荷兰安全委员会主席。他说，自MH17航班失事以来，调查已经取得了进展。

The safety board is a committee of independent scientists organized by the NIAID to study drug trials and their safety in the U.S.

数据安全监察委员会是由NIAID为研究美国药物试验和其安全性而组织一些独立科学家构成的委员会。