The charges against the women - 22, 24 and 27 years old - concern a serious violation of the Act on Flammable and Explosive Goods.
The 24-year-old is suspected of having handed over three thermos bombs last fall to a 14-year-old, who carried out a failed bombing in Uppsala the following day.
Detonators for both a gunpowder fuse and an electric fuse were found in the woman's basement storage room. Chats with accounts linked to Foxtrot were found on her phone.
One of the thermos bombs was handed over to the two other women, who transported it to the Stockholm area.
The 22-year-old is also suspected of a particularly serious drug offense.
All three defendants deny the charges.
