holmes is live in martinez. reporter: detectives here tell me that they were shocked, surprised by the large amount of drugs and large amount of weapons all of which they say were loaded. that included an assault weapon. i want you to listen now to the phone call we obtained that first tipped off police. martinez police department. we have a weapon being fired on the street. taking off very quickly. reporter: this 911 call about a gunman opening fire led police to swarm this house on valencia court. i heard a pop, pop, pop. and they told me, get in here. cops are coming. reporter: police released these photos of firearms they found. in the center the most dangerous of the weapons confiscated an ak47. it actually had fixtures to it. it had the handle reconfigured. reporter: the suspect was arrested. every day there s cars up there. that area gets filled they come and go they come and go. reporter: people in the area say they suspected drugs were being sold.
weapons all of which they say were loaded. that included an assault weapon. i want you to listen now to the phone call we obtained that first tipped off police. martinez police department. we have a weapon being fired on the street. taking off very quickly. reporter: this 911 call about a gunman opening fire led police to swarm this house on valencia court. i heard a pop, pop, pop. and they told me, get in here. cops are coming. reporter: police released these photos of firearms they found. in the center the most dangerous of the weapons confiscated an ak47. it actually had fixtures to it. it had the handle reconfigured. reporter: the suspect was arrested. every day there s cars up there. that area gets filled they come and go they come and go. reporter: people in the area say they suspected drugs were being sold. was it rapid fire or single shot. it was rapid fire and he s headed toward the intersection of bush and pacheco. reporter: but concerns bega