(AGI) Cairo, June 25 - Four makeshift bombs exploded within afew minutes in three metro stations in Cairo on Wednesday. Atleast two people were injured by the bombs, which weredescribed as "low intensity" by Egyptian police. Islamistmilitants have stepped up attacks, mostly against the securityforces since last year's overthrow of President Mohamed Morsiand the banning of his party, the Muslim Brotherhood. (AGI) . .