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Real-time surveillance is an important aspect of an intelligent building with modern security demands. The proposed system implements an embedded system for monitoring wireless sensor nodes and camera installed inside a building for security surveillance. A number of surveillance devices in a Zigbee protocol (IEEE 802.15.4) based wireless network are connected to a Beagle-Board Single Board Computer (SBC) based surveillance management system. Remote alerting on fire and intruder detection are the key features of the system. When smoke or intruder movement is detected, the system sends warning messages through Short Message Service (SMS) to cell phones, starts capturing real-time video for fixed duration and makes the alarm on. The captured video clip is immediately uploaded to an FTP (File Transfer Protocol) webserver so that it can be retrieved later from anywhere around the world. The advantages of the system are that it guarantees reliability by integrating various components of a security system (sensors, alarm, camera, wireless connectivity etc.) and utilizes an FTP server for camera feeds.