BP delays work on stopgap and permanent well fix

After days of progress on the Gulf of Mexico oil leak, BP said Wednesday that delays have temporarily stopped work beneath the water on both a stopgap solution and a permanent fix to the gusher.
BP was vague about the reasons for pushing back tests of a new cap meant to trap oil in the well and why it stopped, for up to 48 hours, drilling on a relief well aimed at plugging the gusher for good from underground. LINK