1.   Physical evidence included a stockpile of rust-covered guns recovered from a drained lake bed.

2.   Prosecutors produced rust-covered guns, found in a drained lake bed, that witnesses said were to be used in the killing.

3.   Prosecutors produced rust-covered guns, found in the muck of a drained lake bed, that witnesses said were to be used in the killing.

4.   During the trial, prosecutors produced rust-covered guns, found in a drained lake bed, that witnesses said were to be used in the killing.

5.   Mexico City is vulnerable even to distant quakes because much of it sits atop the unsteady muddy sediments of drained lake beds.

6.   Much of the city is built atop the muddy beds of drained lakes.

7.   The neighborhood was built on a drained lake.

8.   While Mexico City is often hundreds of miles away from the epicenter, it is vulnerable because much of it sits atop the muddy sediments of drained lake beds.