Police in Swaziland have offered a ten-thousand dollar reward for information leading to the conviction of those behind an explosion in the capital, Mbabane, on Friday.

One person was killed and several others wounded in the attack.

Roadblocks were set-up in the the main cities of Mbabane and Manzini and extensive searches were conducted in the area.

Three ministries have been evacuated following bomb threats from a previously unknown group calling themselves the Tigers.

A representative of the group called the Swaziland Times newspaper and said they bombed the office of the deputy prime minister on Friday.

But its not clear what they want.

There's been tension in the country since last months parliamentary elections which were dismissed as a farce by opposition groups