COLOMBO, Sri Lanka - Alcohol and musical instruments have been banned from Sri Lanka's World Cup stadiums as part of a security plan in the co-host nation, police said Friday.

Police chief Mahinda Balasuriya said that drunk spectators or anyone carrying any alcohol will not be allowed entry to grounds.

Police and military personnel will frisk everyone who enters the ground.

Sharp instruments, glass bottles, cans, firecrackers and smoke bombs are also not permitted, he said.

"This is the largest sporting event hosted by Sri Lanka in recent years, we'll assure you the best security," Balasuriya said.

Banners and placards will be permitted, though any with offensive slogans will not be allowed, while national flags other that the countries playing in a match will also be removed.

Sri Lanka had a number of international cricket matches called off during a 26-year civil war in the island.

However, the country has had no security issues since government troops defeated Tamil Tiger separatists in 2009.

United States state department Thursday alerted its citizens travelling to India, Sri Lanka and Bangladesh of the possiboility of terrorist attacks.

"While the U.S. government has no specific threat information regarding the Cricket World Cup, large, high-profile events of this nature can be targets for terrorist attacks," the department said on its website.