WASHINGTON — Spiders have moved in to dine on the bugs drawn by the lights. Wasps have built nests to eat the spiders. And a “community” of dark biofilm has spread over the surface of the marble like the spots of a giant leopard.

BEIRUT — The global standoff between the United States and Iran over shipping escalated Saturday when the United States issued a warrant for the seizure of an Iranian oil tanker detained in Gibraltar, just hours after the ship was ordered released.

KABUL, Afghanistan — A bomb exploded at a wedding reception in the Afghan capital Saturday night, wounding at least 20 people, officials said. There was no immediate claim of responsibility for the blast.