A school district in Santa Fe, Texas has initiated a lockdown and triggered a “major law enforcement response” after reports of a shooter on a high-school campus. It’s not clear whether this is still an ongoing threat or if the lockdown is cautionary.

Remember that first details in breaking news stories are not terribly reliable and that it takes a while to get the story correct. This doesn’t sound good, however:

The Harris County Sheriff’s Office confirmed they are also sending deputies to the scene.

Life Flight was also called to the school.

According to students interviewed by KHOU, police got into a gunfight with the suspect. There are unconfirmed reports of injuries:

Some students say they were evacuated down the street to a nearby business as police surrounded the school. There are unconfirmed reports police officers exchanged gunfire with the suspect and there are injuries at the scene.

CNN reports that one girl was shot in the leg, and that the weapon appeared to be a shotgun. NBC reports that ATF is now responding to the scene as well.

We’ll keep an eye on this and update as developments warrant.

Update: I’m following ABC’s Periscope feed, and the parent they’re interviewing says this school had a false alarm two months ago. The police seem to be milling around now, though, which seems to indicate that the threat may already be over. There are a number of ambulances on hand, and there appear to be multiple injuries.

Update: ABC now reporting that their helicopter has seen one body under a sheet, but nothing’s been confirmed.

Update: One LifeFlight helicopter has already transported one person, and there are now three on the ground for others.

Update: The local NBC affiliate says one person is in custody, according to the Galveston police.

Update: The assistant principal confirmed on camera that the police have the shooter in custody, but won’t comment further on any details of the shooting.

Update: Still no word on injuries, but one student tells ABC that his friend spotted the shooter and set off the fire alarm, which may have limited opportunities for targets.

Update: Officially “active but contained,” and confirmation of injuries but not deaths as of yet:

“Active but contained” probably means that investigators have not finished their work, and perhaps also that police have not yet confirmed that all areas are clear of any threats.

Update: Information has been slow to emerge from the shooting, but this is tough news to hear at any time:

KHOU is hearing that it may be as many as eight dead:

One has to wonder whether the shotgun was the only weapon used in this instance.

Update: CBS gives a more grim but detailed look at the casualties:

The school resource officer would likely have been the first to engage the suspect. Other reports suggest that the perp had both a shotgun and a pistol, which would have allowed him more flexibility in an engagement. And KHOU’s Melissa Correa reports that the perp may have more surprises in store for law enforcement:

Also, they have the shooter under arrest, but also one other male is being detained as “a person of interest.”

Update: NBC’s Pete Williams is also hearing about explosive devices:

Update: Reuters reports that police have found potential explosive devices at multiple locations:

If this is true, someone had to know of the threat before today.

Update: Local law enforcement has confirmed the existence of multiple explosive devices inside and outside the school:

Give the officials there lots of credit for keeping the media abreast of all these developments. The breadth of this attack and its level of preparation raise all sorts of questions. How did this threat get missed? This is clearly not an impulse attack.

Update: One of the dead is a teacher, CNN reports; the other nine are students. Meanwhile, the suspect has been identified as Dimitrios Pagourtzis.

The search-warrant discussion here is pointless. Police will stay on site until the warrant is issued no matter whether Pagourtzis is a juvenile or not. Nothing will disappear while that happens.

Interestingly, there seems to be no social-media footprint for Pagourtzis.

Update: Looks like “person of interest” is morphing into “accomplice”: