Security has been tightened in Swaziland, where the police say they have found bombs near railways, bridges and roads.
Authorities are investigating a failed bombing near one of the royal palaces near the capital, Mbabane, on Saturday.
Two opposition activists were killed planting the bomb, while a South African survivor was detained.
The attempted bombings follow protests against one of the world's last absolute monarchies.
The Swazi opposition says they are a result of people's frustrations with a ban on political parties.
Swaziland held its first parliamentary election under a new constitution a week ago.
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Some Swazis blame King Mswati III for plunging the country into poverty and failing to tackle an Aids epidemic.
The king has been in power since 1986.
His government recently organised a lavish $12m (Ј6.6m) party to celebrate the king's 40th birthday as well as the 40th anniversary of the country's independence from Britain.
(BBC)
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