A man was held on high bail at arraignment today after Transportation Security Administration officials discovered a large quantity of cocaine in his checked baggage at Logan Airport, Suffolk County District Attorney Daniel F. Conley said.

LUYONGA MUKASA (D.O.B 11/09/1964), of Bedford, Texas, was held on $200,000 cash bail following his arraignment in East Boston District Court on charges of trafficking in more than 200 grams of cocaine. Prosecutors had sought $500,000 bail.

Shortly after 8:15 p.m. yesterday evening, Conley said, TSA requested assistance at the American Airlines bag room regarding a suspicious laptop checked onto its flight to London’s Heathrow Airport. Upon examination of the laptop, officials found a plastic bag containing a powdery white substance beneath the loose keyboard. The Massachusetts Port Authority Fire Department responded for a possible hazmat situation, but a field test indicated that the substance was in fact cocaine.

Officials identified the man who checked the bag as Mukasa. State Police questioned him at the gate where the flight was boarding. He initially denied knowledge of any contraband material that might be in his checked bagged.

Mukasa agreed to accompany officers for further questioning where he later stated that the laptop was his and that he placed approximately 300 grams of cocaine inside it prior to flying from Panama to Atlanta earlier that day. He stated that he bought the cocaine in Panama and planned to sell it in London to help pay for a plane ticket from there to his native Uganda, where he was going to visit his sick mother.

Muskasa was represented by attorney Kelli Lea Porges and will return to court on June 28, Conley said.