91.   There was dense fog in the interior of Puerto Rico in the valleys.

92.   There was fog in the interior valleys of Puerto Rico.

93.   There was thick fog in the area at the time.

94.   They said there was fog in the area at the time.

95.   Fog was particularly thick early Thursday morning, the Dutch meterological service said.

96.   Fog was again a factor on Sunday, forcing a two-hour delay before the third round could be completed.

97.   He said it was still not clear what caused the accident, although heavy fog may have been a factor.

98.   There was some fog at the time, but visibility was otherwise adequate.

99.   The fog was so dense that the sophisticated CAT-IIIA landing system installed last week at the Indira Gandhi International Airport was unable to guide incoming flights.