Said security pact is necessary to give Afghan people confidence.
Officials do not want to go to the so-called zero option.
Troop deal hangs in balance after Hamid Karzai refused to sign.
Attack took place next to police HQ building in a Taliban stronghold.
Afghan leader condemned attack that killed child and wounded two women.
The two explosions struck in country's eastern Nangarhar province.
Still refused to commit to Bilateral Security Agreement before year-end.
The Taliban have so far refused to talk directly with Karzai's government.
Six bodies found previously in southern province ID'd as policemen.
Attack struck near the site of upcoming talks on a U.S. troop deal.