(LONDON) — The British man who killed four people during a London rampage had made three trips to Saudi Arabia: He taught English there twice on a work visa and returned on a visa usually granted to those going on a religious pilgrimage. More details about attacker Khalid Masood’s travels, confirmed by the Saudi Arabian embassy in Britain, emerged Saturday amid a massive British police effort to discover how a homegrown ex-con with a violent streak became radicalized and why he launched a deadly attack Wednesday on Westminster Bridge. The embassy said he taught English in Saudi Arabia from November 2005 to November 2006 and again from April 2008 to April 2009, with legitimate work visas both times.