»Flat tire for Caltrain.

From the 5.05 from San Antonio:

Just after leaving the Menlo Park Station, the conductor announced over the intercom that we had a flat tire and were slowing to a halt to see if we could fix it. Did I hear aright?

The Atherton police seem to have blockaded the tracks ahead; we're stopped within sight, perhaps a hundred yards in front of, the Atherton platform.
... everyone is asking the conductor about debarking from the train. Of course, because we're before the Atherton station, no-one can get off.

UPDATE:
The area was taped off as a crime scene; a body bag was visible from the train. I took some photos, and we'll see if any of them turn out.
UPDATE:
From the Chronicle's local news roundup:

A suspicious package addressed to President George W. Bush was detonated by a water cannon at an Atherton train station Thursday, authorities said today.
A postal worker noticed the box in the mail drop at the Caltrain station around 5 p.m. and called police, who in turn called the San Mateo County Sheriff's Office bomb squad, according to sheriff's spokeswoman Bronwyn Hogan.
Hogan said once it was discovered that the parcel was addressed to the president, the U.S. Secret Service and the Bureau of Alcohol, Tobacco, Firearms and Explosives were called in to investigate.
Following an examination of the possible device, the bomb squad blew apart the box with a water cannon, Hogan said.
Authorities are still investigating the parcel and whether or not it was an explosive device. No suspects have been identified.
Trains did not stop at the station and were delayed for more than an hour during the operation, according to Caltrain spokeswoman Jayme Maltbie Kunz.