Philippine president blames foreign militants for bombing that killed 4 Christian worshippers

A bomb blast blamed on foreign terrorists killed four people and injured dozens of Catholic worshippers in the southern Philippines. The explosion occurred during a Mass at Mindanao State University in Marawi city. The president condemned the attack and mentioned the presence of a foreign element. The bombing could be a retaliatory act by Muslim militants following recent battle setbacks. Security forces have been put on alert in Manila and investigations are underway.