Preliminary information indicated that the gunman was wearing a construction vest and a gas mask.

初步信息显示，枪手身穿橙色背心，戴着防毒面具。

The Moscow's branch of the Russian Investigative Committee said preliminary information indicated a bomb exploded in the SUV driven by 29-year-old Daria Dugina.

俄罗斯调查委员会莫斯科分部表示，初步信息显示，一枚炸弹在29岁的达莉亚·杜吉纳驾驶的SUV中爆炸。

Upon receiving the first preliminary hard information of this nature last Tuesday morning at nine a.m., I directed that our surveillance be stepped up.

“上周二早上九点，当我收到了第一份关于这个消息的初步消息后，我当即决定加强对该地的监控。