Earthquake causing delays in shipments from Japan?

I went mouse shopping this weekend. Computer mouse that is. I quickly ran into issues. Shelves were bare. Future Shop. Best Buy. They had a few mice, but none of any candidate models I wanted. All staff admitted they were anxiously awaiting merchandise shipments that were weeks overdue.

What I don't quite understand is how the earthquake in Japan might be responsible for the delay, assuming that it is the cause. Does this stuff even come from Japan?

We're also experiencing electronic delivery delay at work, where a projector for my classroom is delayed until mid-May.