As we reported on Friday, Culiacan, the capital of the northwestern Mexican state of Sinaloa, was the scene of a two-day forum last week, the International Forum on Illicit Drugs, where there was much criticism of the Mexican drug war and the planned escalation of it envisaged by Plan Merida, the $1.4 anti-drug aid package cooked up by the Bush and Calderon administrations. The so-called "narco-violence," which might more accurately be called "prohibition-related violence," was, unsurprisingly, a central concern of presenters at the forum. In the year and a half since President Calderon took office and unleashed the Mexican military on the narcos, some 4,000 people have been killed. As if to punctuate that concern, just as the conference was wrapping up Wednesday, a series of armed confrontations broke out in central Culiacan. Sparked by a joint military-federal police sweep that was attacked by AK-47-wielding narcos in a Chevy Tahoe, gun battles broke out across the city as narcos swooped in to lend aid to their colleagues being harassed and captured by the law and other, rival narcos intervened. In one shoot-out between rival narco factions, two men were killed. In another shoot-out, between narcos and state police, two cops were killed. The military and police arrested 13 presumed cartel gun-men and seized a huge arsenal of heavy weapons, cash, and drugs. Thursday morning, military pick-ups and Hummers were cruising the streets of Culiacan, soldiers at their posts in back with heavy machine guns. Military helicopters buzzed over the city, although it was unclear whether they were supporting urban ground operations or were on their way to search for marijuana and poppy fields in the nearby mountains. (I apologize for not having any photos of this stuff. My camera battery went dead Tuesday morning, and having brought with me the wrong bag of electronic stuff, I couldn't recharge it. I went to five different camera stores in Culiacan looking for either a new battery or a charger, to no avail. I finally found a store in Mexico City Friday that charged it for me, so I have lots of photos of Saturday's Global Marijuana March in Mexico City. They will show up in a blog post later today.) The heavy military and law enforcement presence didn’t do much good. Friday night, the narcos struck back, ambushing a federal police patrol in the heart of Culican, killing four officers and leaving three other seriously wounded. But it wasn't just narcos vs. cops and soldiers Friday night. As reported by the Mexican news agency Notimex, a little after 11 Friday night, at least 60 armed men broke into three houses in a city neighborhood and seized five men, then took off in a 15-vehicle convoy, which was in turn attacked, leaving one man dead at that scene. At the same time, two other shoot-outs erupted in different neighborhoods of the city, while simultaneously, on the outskirts of town, presumed narcos shot and killed two Culiacan city police. It's not always easy to figure out who is killing whom. There are local, state, and federal police, any one of whom could be working for the cartels. There's the army. Then there are the competing cartels themselves. In Culiacan, long controlled by Joaquin "El Chapo" Guzman and his Sinaloa cartel, Guzman and his group are being challenged by the Arrellano Felix Juarez cartel, which wants to take over "la plaza," or the franchise, as the local drug connection is known. Just to complicate things further, the Juarez cartel is allegedly being aided by the Zetas, the former elite anti-drug soldiers turned cartel hit-men, who usually work for the Gulf cartel. And this is just in Culiacan. There are other prohibition-related killings every day, soldiers and police being assassinated every day. On Saturday, the Mexican secretary of public security held a ceremony to honor the nine federal police killed by the narcos in the last few days. Another was gunned down in the Mexico City suburb of Coyoacan Friday night, too. All of this pathology, of course, is a direct result of prohibitionist drug polices aggressively pursued by Washington and Mexico City. And what is their response? Let's have more of the same, only more so.