PVC pipe

また銃絡みの事件が起きました。米アラバマ州ミッドランドシティーで、男がスクールバスに乗り込み、運転手を射殺した上で6歳の子供を連れ出し、自宅裏の地下室に立てこもっています。

Man shoots Alabama bus driver, holds child hostage underground
(CNN) -- A man boarded a school bus in Alabama, police said, shot the driver, took a 6-year-old boy hostage and hours later was still holding the child in an underground bunker early Wednesday.

The incident started Tuesday afternoon and continued early Wednesday morning with authorities still desperately trying to free the young child.
Late in the evening Tuesday, the man had the child in some sort of underground bunker or storm shelter, and authorities were communicating with him through a PVC pipe, CNN affiliate WSFA reported.

説得活動はa PVC pipeを通してとあります。これはpolyvinyl chloride pipe（「塩化ビニル管」）の略で、空気抗の役目を果たすものかと思われます。早期の解決を祈ります。（UG）

"We will continue to work diligently through the night in an effort to bring closure to this incident as quickly as possible," the Dale County Sheriff's Department said at 11 p.m. CT.
Hours later, the hostage situation was still ongoing, WSFA reported. More than 13 hours after the ordeal had began, the child was still underground.

http://edition.cnn.com/2013/01/30/us/alabama-bus-man-shot/index.html?hpt=us_c1