From my view, DeSean Jackson was running a slant on the far side of the field, lined up to Kevin Kolb's right.
Asante Samuel was covering him as Jackson made the catch, hit the ground and then grabbed for his lower back.
Jackson remained on the ground as athletic trainer Rick Burkholder and others came over. Andy Reid and teammate Jason Avant also came over to check on Jackson.
He eventually got up very slowly, but needed help to make his way to the cart on the sideline. I saw Jackson favoring his left leg, but others saw him favoring his right leg. Since the Eagles announced it was in fact a back injury, it's reasonable to guess he was favoring different legs because of his general discomfort.
While riding in the cart, Jackson had his face down in his arm in obvious distress.
UPDATE: Eagles sources tell the Inquirer's Jeff McLane that the injury is not serious.
Obviously, Jackson's injury is the story at camp today, and we'll have updates as soon as we get them. But, for now, here's what else I saw at practice this afternoon:
* Seventh-round pick Kurt Coleman made a leaping interception of Michael Vick, and Quintin Mikell was the first guy to get up and run over to congratulate him. Mikell was off to the side with the rest of the first team, but went out of his way to give props to the rookie.
* Similar situation after a Jeremy Maclin leaping grab. Kolb has thrown a lot of nice deep balls here so far, but this was not one of them. It was a straight jump-ball between Maclin and Nate Allen. Maclin came down with it, as Avant, Jackson and Riley Cooper ran 20 yards or so down the field to congratulate him.
* Maclin also caught a bomb from Kolb on the other side of the field against Samuel, although the defense wanted an offensive pass interference to be called. He makes some impressive plays on the ball.
* During position drills, the players sometimes huddle and put their hands in before the drill begins. The defensive backs yell "Get money!" when they break. The wide receivers chant "Family!" This is hilarious to me. Anyone else?
* Kolb took off after finding no one to throw to, before Omar Gaither ran him out of bounds. "First down," Kolb said. "Coverage sack," responded Gaither.
* Several passes deflected today. As we learned from the Football Outsiders 2010 Almanac, the Eagles led the league in that category both on offense and defense last year.
* Overheard someone say Cooper resembles Tim Riggins from Friday Night Lights. Thoughts?
* A nice block on Ernie Sims by Max Jean-Gilles on a screen pass. Jean-Gilles got to the second level, earning a fist pound from offensive line coach Juan Castillo.
* To the jerk who yelled "Get up! I just bought your hat!" to Jackson as he lay on the field after getting injured: You should never attend a sporting event of any kind in the future. Get a clue.
* Another scuffle in the afternoon. Defensive tackle Antonio Dixon was in the middle of it. I didn't see who the offensive lineman was, but a couple of other reporters said it was backup center Mike McGlynn.
* Stewart Bradley did a good job in pass coverage against Brent Celek. Earlier in the week, Reid said he would monitor players like Bradley, who are coming off injury. We saw a little of that this afternoon. Bradley took a few breathers, and Omar Gaither filled in at middle linebacker. Bradley may have cramped up - he was stretching on the sideline.
* Quintin Demps had a nice interception on Vick, who was looking deep for Cooper. Macho Harris was also in on the coverage.
* Samuel picked off Kolb, who was looking for Maclin along the far sideline.
* Ellis Hobbs did a good job to break up a deep ball intended for Jackson.
* Kolb hit Celek for a big play over the middle. Another time, Kolb looked for Celek to the far sideline, but his pass was incomplete. Meanwhile, Maclin was wide open down the left side of the field, waving his hand for the ball.
And download the 2010 MTC app from the ITunes store.