Wazobia's station chief Sanusi Bello Kankarofi told AFP news agency that a third journalist was released after being questioned by police.

BBC: Nigeria journalists charged over Kano polio deaths

The head of the central bank, Sanusi Lamido Sanusi, and Finance Minister Ngozi Okonji-Iweala have been forced to explain their actions like none of their predecessors.

BBC: Viewpoint: 'Nigeria Spring' here to stay

Yobe state police commissioner Sanusi Rufai said it was nevertheless too early to know who was behind the attack, which happened either late on Saturday or before dawn on Sunday.

BBC: Foreign doctors killed in north-eastern Nigeria

Lamido Sanusi, a risk-control officer who will take over next January as the head of Nigeria's oldest bank, First Bank, is disappointed that regulators are not tougher in insisting on transparency and disclosure of information.

ECONOMIST: Doubts persist about Nigeria��s banks

"At this point we cannot say if they are Boko Haram, hired killers or common criminals, but we have cordoned off the area and are in the process of interrogating them, " Commissioner Sanusi Rufa'i said.

CNN: STORY HIGHLIGHTS

The government finance team led by respected pair central bank governor Lamido Sanusi and Finance Minister Ngozi Okonjo-Iweala have long argued that removing the subsidy would free up money to invest in other sectors and relieve poverty.

BBC: Nigeria fury as fuel prices double after subsidy ends

The list of casualties reads like a Who's Who of Mahathir backers: the PM's close friend and former finance minister Daim Zainuddin, former agriculture minister Sanusi Junid, the ex-deputy premier Ghafar Baba, former chief minister of Malacca Rahim Tamby Chik, current deputy ministers Khalid Yunus and Railey Jeffrey, and the party's veteran information chief Hussein Ahmad.

CNN: HEN MALAYSIAN PRIME MINISTER