<span style="color: #222222;">At least 17 were killed and 32 others injured in an explosion outside Egypt's National Cancer Institute in central Cairo, Egypt's health ministry said early today. <br />''<br />''A car driving against traffic on Cairo's corniche collided with three other cars, causing the explosion, Egypt's interior ministry said in a statement. Videos posted online showed fire trucks trying to control a massive fire, which damaged several cars. Egypt's public prosecutor is investigating the cause of the incident, but there was no official statement indicating that the explosion was an attack.</span><br />