It's the fourth mass school abduction in the country since December.

這是12月以來國內發生的第四起大規模校園綁架事件。

The Federal College of Forestry Mechanization sits on the outskirts of Kaduna city, a region where banditry has vested for years.

聯邦林業機械化學院位於卡杜納市的郊區，該地區多年來一直是土匪活動的歸宿。

Kaduna state security commissioner said that an armed gang attacked the college at around 11:30 p.m. Local time on Thursday.

卡杜納州安全專員表示，當地時間週四晚上11點30分左右，一個武裝團伙襲擊了該學院。

He said that the army rescued some 180 people in the early hours of Friday, but that quote about 30 students, a mix of males and females are yet to be accounted for.

他說，軍方在週五凌晨救出約180人，但報價約30名學生，男女混雜，尚待統計。

One local resident said he'd heard sporadic gunshots which he initially thought were military exercises from the nearby Nigerian Defence Academy.

一位當地居民說，他聽到了零星的槍聲，他最初以為是附近尼日利亞國防學院的軍事演習。

The trend of abduction from boarding schools was started by the jihadist group Boko Haram, but it has since been taken up by armed criminal gangs seeking ransom.

寄宿學校的綁架風潮是由聖戰組織 "博科聖地 "發起的，但此後又被尋求贖金的武裝幫派所利用。

Military and police attempts to tackle the gangs have had little success so far.

軍方和警方試圖解決這些團伙的問題，但迄今收效甚微。