Troops were part of search party locating handlers of recently freed Canadian-American family
So far no group has claimed responsibility for the incident
Woman was rushed to Agency Headquarters Hospital Kurram in critical condition
Security officials say local peace force was searching for militants in Loti area when one member stepped on landmine
No group has claimed responsibility for the attack till the report was filed
Inflammable substance was lit in a house where mines were kept, resulting in fire and huge explosion