Depending on the source it was either a fan problem or a press problem.
From a F1 site that reports purely on the news by the look of things we get that Alonso had a problem with the press:
http://www.f1sa.com/...c...&Itemid=219Fernando Alonso's vast popularity proved frustrating to the former double Formula One World Champion at the Circuit de Catalunya on Thursday. When attempting to meet his fans and sign autographs, the Renault driver found himself amid a frantic crush in the paddock, and ultimately escaped to the sanity of a rival team's garage. His bodyguard tried fervently, and physically, to give 27-year-old Alonso some space, but the enthusiasm of some members of the press actually led to one or two minor fisticuffs. Dismayed by the lack of order, Alonso himself raised his voice and demanded calm, before scurrying for cover.
Yet on another site the same event Alonso is mobbed by his fans.
http://www.typically...cle_21278.shtmlFernando Alonso had to hide from his fans in Montemeló on Thursday ahead of this weekend’s Spanish Formula One Grand Prix. He took cover in a garage after what is described as an avalanche of fans chased him for an autograph. There were insults to members of the press and several photographers came to blows, while Alonso lamented the lack of crowd control.
from another thread:
To put it in short...
On Thursday, during the fans autograph signing session, Alonso got angry due to the constant pushing and hitting from the photographers. Also the photographers were making impossible for him to reach the fans and have some fun with them.
In the end, Alonso got mad when he saw one of the photographers standing over the wheel of one of the wheelchairs that can be seen on the picture. He reacted as you've seen (kudos to him), went inside the garage and, a few minutes later, when the media had gone away, he went out again to sign more autographs but in a more relaxed way.
Edit: I think I can find the full transcript of what Alonso said regarding this incident on Friday morning, but I would have to translate it to English. If anybody's interested, just ask.
The photographers had first some time to get pictures. Then, they had to leave for the fans to enter. They didn't leave, and not just that, as you said, one even used the wheel of the wheelchair as a "stand". And that's when this moment took place.

Was anyone actually there who could shed light on what actually happened or know of other sources that give more details. It would be a sad day if the press were spoiling the interaction of the drivers with their fans.
It is unbelievable that something like this isn't all over the news.
Edited by Gilles4Ever, 14 May 2009 - 15:33.