World Cup players had to evacuate their Trinidad hotel when a tear gas canister exploded on the same floor as the rooms belonging to the Pakistan players.
Pakistan coach Bob Woolmer awaits further developments
Security staff at the Hilton hotel had to knock on doors of individual players to alert them to leave the building.
The South Africans left the vicinity in buses and limousines. The Pakistanis waited in the car-park, while Ireland and Canada were already out training.
At least three hotel staff were taken to hospital but no players were hurt.
Several fire engines and emergency vehicles were seen at the hotel as investigations continued.
I saw a lot of smoke coming out from the corridor so I ran down
Pakistan all-rounder Shahid Afridi told reporters: "I have no idea what happened. I had just woken up when the security man knocked on the door and said 'get out of the room'.
"But I went back to sleep. Then he knocked again, and said 'get out of the room'. Then I did and went downstairs."
"I heard there was a fire on the eighth floor."
His story appeared to tally with the point of view of his team-mate Mohammad Sami.
Pakistan's Inzamam-ul-Haq and Shahid Afridi look unflustered
The paceman said: "I was on the sixth floor when a security man came to my room and asked me to vacate the hotel.
"I saw a lot of smoke coming out from the corridor so I ran down."
Penny Commissiong-Chow, the communications manager of the local organising
committee, said: "The Pakistan players and officials were preparing to go
sightseeing while the South Africans were taken from the venue to a
Port-of-Spain restaurant, where they had breakfast."
Ireland coach Adrian Birrell said his team were not near the hotel at the
Birrell said: "Thankfully, we were far away from the scene but we are not
worried. It has no effect on us."