NEW YORK, Jumada II 8, 1436, Mar 28, 2015, SPA -- Emergency workers are searching for at least two people still missing after an apparent gas line explosion leveled three apartment buildings as investigators piece together what exactly caused the blast that injured 22. Special canine units on Saturday will sniff for anyone possibly trapped beneath the heap of loose brick and rubble. Detectives issued posters seeking information on the whereabouts of two men believed to have been in the sushi restaurant on the ground-floor of one of the now-collapsed buildings: 26-year-old Moises Lucon, who worked at the restaurant, and 23-year-old Nicholas Figueroa, a bowling alley worker who had been there on a date, according to AP. Their families frantically searched, showing photos of their loved ones and asking for help. -- SPA 18:47 LOCAL TIME 15:47 GMT www.spa.gov.sa/w