International Cricket Council president David Morgan insists "cricket must go on" despite the attack on the Sri Lanka team in Pakistan.
Seven players were reported hurt when gunmen opened fire on the Sri Lankan team bus as it headed to the Gaddafi Stadium in Lahore.
Thilan Samaraweera and Tharanga Paranavitana were both hospitalised while Mahela Jayawardene, Kumar Sangakkara, Ajantha Mendis, Suranka Lakmal and Chaminda Vaas sustained lesser injuries.
Assistant coach Paul Farbrace also needed treatment and the touring party were immediately airlifted home. They had only been playing in the series after India refused to tour their near-neighbours.
Fourth umpire Ahsan Raza, who was travelling in a different vehicle, was shot. ICC chief executive Haroon Lorgat confirmed he was still in an intensive care unit. The rest of the match officials, including English match referee Chris Broad, had been flown to Abu Dhabi.
Speaking at a news conference staged at Lord's, Morgan admitted that players would now be even more uncertain over returning to Pakistan.
"On many occasions we were told cricket would not be targeted in Pakistan," he said. "This morning's events prove that incorrect.
"I believe cricket must go on. I think it was important England returned to India (in December) after the Mumbai bombings.
"But we have to provide the safest possible environment for cricket to be played.
"I think the situation in Pakistan is such that teams should not be expected to go there in the immediate future, but things can change and they can change very quickly."
Pakistan is due to be co-hosting the 2011 World Cup, with 14 games scheduled to be staged in the country.
Morgan announced that the ICC will discuss the current itinerary of the tournament at their next board meeting in April.
Bangladesh, India and Sri Lanka are also hosting the event. The Gaddafi Stadium was due to be used for one of the semi-finals.
"The ICC Cricket Cup is due to be staged in the Indian sub-continent, shared between four countries," he said. "That is the current plan.
"The board will have to think very carefully about the extent to which Pakistan will be used for that event.
"It's a very important event but safety and security of players, officials and supporters is very important. The board will be taking that into account.
"The board will be meeting in April and will consider the ICC Cricket World Cup in a great deal of detail.
"There is an organising committee chaired by Sharad Pawar, vice-president of the ICC, and you can be certain that he and his team will be engaged on the very topic that you referred to immediately."