Here are my images from the time I spent at Silom last night. I arrived not long after what authorities say was an M79 grenade exploded near the Dusit Thani hotel, in an area where pro-government demonstrators had been rallying.
This area is across an intersection from the red shirt barricade that I wrote about previously. (Compare this image from April 21 with this one from last night.)
The blast that happened here was one of a series of explosions that killed at least one person and injured at least 75. (Various sources are providing different numbers at this point.)
You can find more details by searching Google News or by checking out this story in the Bangkok Post.
I was concentrating on TV and radio work, so I didn’t have much time to snap many images. But these photos should give you a sense of what the scene looked like in the hours after the blast occurred.
For commentary on the evening, I suggest checking out this blog post from Andrew Marshall, who was there last night.
UPDATE: As Andrew points out, you can find some images from last night in this New York Times slide show.