The youths set off their suicide belts in the town of Mora as a police officer became suspicious of their appearance and approached to question them, a security source said.
"The toll is five dead including two civilians, a police inspector and the two suicide bombers," a security source at the scene told AFP.
A separate source close to regional security forces confirmed the toll and said the attackers, who aimed to target the town's market, were a "young girl and a young boy," without giving any more details.
The police officer who was killed had just finished his shift and gone to the market to buy food, the security source said.
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"When he saw five suspects he challenged them, but the first suicide bomber exploded himself," killing the officer immediately.
The second bomber then detonated his device a few hundred metres (yards) away, while the other three suspects fled, the source added.
A police hunt was underway for the remaining suspects.
One person was said to be in serious condition after the attacks.