Total shipments reached 19.5 million units last year , compared with 8.9 million units in 2001 .
Gartner 's report said global WLAN equipment shipments reached 19.5 million last year , a 120 percent increase over 2001 's 8.9 million units .
Police have arrested 21 people in connection with the murder of a young Nigerian child whose headless and limbless torso was found floating in the river Thames .