PHILADELPHIA (WPVI) -- Three men are in custody and a fourth suspect is being sought after a barricade situation inside a Sprint store on Sunday in Chestnut Hill.Officers responded just before 1 p.m. to a Sprint store located on the 7700 block of Crittenden Street in the Chestnut Hill section of Philadelphia.Police said they arrived to find three men wearing masks, armed inside the business. Police said the suspects barricaded themselves inside with three Sprint employees.The workers were able to get out, but it's unclear if they got out on their own or if the suspects let them go.The three men were later arrested. Police say they found one suspect hiding inside the ductwork. Two weapons were recovered.A fourth suspect fled in a dark gray or black Nissan, said police.No injuries were reported.Anyone with any information is asked to call police at 215-686-TIPS.