MANILA, Philippines — The Philippine president blamed “foreign terrorists” for a bomb blast that killed four people Sunday, wounded dozens of other Catholic worshippers in the south and sparked a security alarm, including in the capital, Manila, where state forces were put on alert. The suspected bomb, which the police said was made from a mortar round, went off and hit students and teachers who attended a Mass in a gymnasium at Mindanao State University in southern Marawi city, Taha Mandangan, the security chief of the state-run campus, told The Associated Press by telephone. [time-brightcove not-tgx=”true”] Dozens of students and teachers dashed out of the gym and the wounded were taken to hospitals. Regional military commander Maj.