The operations centre for the forces loyal to Libya's Government of National Accord (GNA) said another 20 of its fighters were wounded in the attacks.
A spokesman for the forces, Reda Issa, said the two attacks took place in the Gharbiyat area west of Sirte, near a centre used to distribute food, ammunition and other supplies to pro-GNA fighters.
Backed by US air strikes, pro-GNA forces are fighting to clear the last pockets of IS resistance in Sirte, ex-dictator Moamer Kadhafi's hometown which the jihadists seized in June of last year.
Last week the loyalists seized a conference centre in the city used by IS as its command centre, leaving the jihadists in control of only a few residential areas.
The US Africa Command said Thursday that it had carried out five more air strikes on IS targets in Sirte on Wednesday in support of the pro-GNA forces, bringing the total to 62 since August 1.
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