会员”静待花开”关于一篇新闻报道的语法问题

“Right now the US coast guard leading the urgent search for a group of modern-day adventurers after the submersible carrying them to the Titanic shipwreck lost contact with the surface today about an hour and 45 minutes into their journey.” 我有个很弱的问题，这个句子的”leading”前面为什么没有is? 截的外媒的报道，感觉这个句子是不是掉字了，就是找不到原文。