81.   Police said they were investigating causes of the fire, including possible arson.

82.   Police said they were investigating the cause the accident.

83.   Police said they were still investigating the cause of the fire but discounted the possibility that it had been set intentionally.

84.   Police said Thursday they were investigating the cause of death.

85.   Police were investigating its cause.

86.   Police were investigating the cause of death and were trying to identify the four men, spokesman Stefano Sarafini said.

87.   Police were investigating the cause of fire.

88.   Police were investigating the cause of the accident, which severely disrupted traffic on the Tuen Mun Highway in the New Territories, bordering China.

89.   Police were investigating the cause of the accident.