A handmade bomb exploded on a subway train in southwest London on Friday morning, and police are investigating the incident as a terrorist attack, authorities said.At least 22 people were injured, health authorities said, after the blast in a train car near Parsons Green station. Police were called around 8:20 a.m. after reports of a fire on the train, which was traveling into London, they said.(Getty)The train was crowded due to morning rush hour, and many of the victims suffered facial burns, according to local media. There have so far been no reports of fatality.The BBC showed a video of…READ FULL ARTICLE