Three people were killed and 25 others were injured, in the heavy blast, which took place this morning in front of the provincial court of Farah province in western Afghanistan.Afghan online newspaper (Khaama Press) quoted a provincial hospital chief Abdul Jabar Shayeq as saying that at least 25 people including 20 civilians and 5 security forces injured following the incident were taken to the hospital so far.On the other hand, a local official speaking on the condition of anonymity said the attack was carried out by six gunmen