“SWAT: Under Siege” (**1/2 out of four) was an action-packed fourth entry in the series that began with the 2003 Colin Farrell/Samuel Jackson thriller about a SWAT compound that comes under fire from an international terrorist (Matthew Marsden) who will stop at nothing to apprehend a mysterious criminal (Michael Jai White) who has crucial information and is inside SWAT headquarters. Somewhat routine and features some uneven acting but is packed with enough firepower, hand-to-hand combat, and fast-paced action to give fans their money’s worth. Not at the level of the first-rate 2003 original but better than the last few “SWAT” entries.