NEW : FBI : Kevin Brown accused of carrying a weapon or explosives onto a plane . The Jamaican national tried to board an Air Jamaica flight at Orlando airport . He was stopped by the pilot and police, who found two knives in his luggage. Some ticket counters were shut down , and 11 flights were delayed .
NEW : FBI : Kevin Brown accused of carrying a weapon or explosives onto a plane . The Jamaican national tried to board an Air Jamaica flight at Orlando airport . Official says suspicious items posed no immediate danger to other travelers . Some ticket counters were shut down , and 11 flights were delayed .