Police said they arrested three city men and seized more than $2.6 million worth of heroin and $22,300 worth of crack cocaine from a house in the Frankford section late last night.

Edwin Melendez, 23, Luis Alvarado, 26, and Pablo Marajo, 23, were taken into custody shortly after 10:30 p.m. and were subsequently charged with narcotics offenses, Police Lt. Frank Vanore said today.

Police discovered the cache of drugs after someone called 911 to report a burglary in progress at a house on the 1300 block of Kennedy Street, Vanore said.

"Someone must have seen something they thought wasn't right," he added.

When police arrived, the men were leaving the house through the back door and carrying a large box. When they saw police, they threw the box into the front seat of a car and ran off, Vanore said. Officers caught up with them and found that two of the men were armed.

In the box, officers found 7,839 grams of heroin - about 17.3 pounds - as well as 232 grams of crack cocaine. They also found a 9mm handgun, a gas-powered BB gun, and $71 in cash.

The three were charged with possession with the intent to deliver, manufacturing, and other related narcotics offenses. Alvarado and Melendez were also charged with robbery.

The house was Marajo's, police said. None of the men has been charged with burglary.