what do these requests mean - do they need to be blocked/denied

[mobiledreamers at gmail.com]

I m seeing a lot of these requests
117.99.178.81 - - [23/Jun/2009:12:41:57 -0700] "-" 400 0 "-" "-" 0.000
what do these requests mean - do they need to be blocked/denied
Thanks

117.99.178.81 - - [23/Jun/2009:12:41:57 -0700] "-" 400 0 "-" "-" 0.000
117.99.178.81 - - [23/Jun/2009:12:41:57 -0700] "-" 400 0 "-" "-" 0.000
117.99.178.81 - - [23/Jun/2009:12:41:57 -0700] "-" 400 0 "-" "-" 0.000
117.99.178.81 - - [23/Jun/2009:12:41:57 -0700] "-" 400 0 "-" "-" 0.000
117.99.178.81 - - [23/Jun/2009:12:41:57 -0700] "-" 400 0 "-" "-" 0.000
117.99.178.81 - - [23/Jun/2009:12:41:57 -0700] "-" 400 0 "-" "-" 0.000
117.99.178.81 - - [23/Jun/2009:12:41:57 -0700] "-" 400 0 "-" "-" 0.000
117.99.178.81 - - [23/Jun/2009:12:41:57 -0700] "-" 400 0 "-" "-" 0.000
117.99.178.81 - - [23/Jun/2009:12:41:57 -0700] "-" 400 0 "-" "-" 0.000
117.99.178.81 - - [23/Jun/2009:12:41:57 -0700] "-" 400 0 "-" "-" 0.000
117.99.178.81 - - [23/Jun/2009:12:41:57 -0700] "-" 400 0 "-" "-" 0.000
186.100.90.91 - - [23/Jun/2009:12:41:57 -0700] "GET
/s?src=notfound&q=ni%C3%B1as%20putas%20menores%20de%20edad%20fotos HTTP/1.1"
200 48068 "
http://www.google.com.ar/search?hl=es&client=firefox-a&channel=s&rls=org.mozilla%3Aes-AR%3Aofficial&hs=kBC&q=fotos+putas+de15+free&btnG=Buscar&meta="
"Mozilla/5.0 (Windows; U; Windows NT 5.1; es-AR; rv:1.9.0.11)
Gecko/2009060215 Firefox/3.0.11" 11.926
117.99.178.81 - - [23/Jun/2009:12:41:57 -0700] "-" 400 0 "-" "-" 0.000
117.99.178.81 - - [23/Jun/2009:12:41:57 -0700] "-" 400 0 "-" "-" 0.000
117.99.178.81 - - [23/Jun/2009:12:41:57 -0700] "-" 400 0 "-" "-" 0.000
117.99.178.81 - - [23/Jun/2009:12:41:57 -0700] "-" 400 0 "-" "-" 0.000
117.99.178.81 - - [23/Jun/2009:12:41:57 -0700] "-" 400 0 "-" "-" 0.000
117.99.178.81 - - [23/Jun/2009:12:41:57 -0700] "-" 400 0 "-" "-" 0.000
117.99.178.81 - - [23/Jun/2009:12:41:57 -0700] "-" 400 0 "-" "-" 0.000
117.99.178.81 - - [23/Jun/2009:12:41:57 -0700] "-" 400 0 "-" "-" 0.000
117.99.178.81 - - [23/Jun/2009:12:41:57 -0700] "-" 400 0 "-" "-" 0.000
117.99.178.81 - - [23/Jun/2009:12:41:57 -0700] "-" 400 0 "-" "-" 0.000
117.99.178.81 - - [23/Jun/2009:12:41:57 -0700] "-" 400 0 "-" "-" 0.000
117.99.178.81 - - [23/Jun/2009:12:41:57 -0700] "-" 400 0 "-" "-" 0.000
117.99.178.81 - - [23/Jun/2009:12:41:57 -0700] "-" 400 0 "-" "-" 0.000
117.99.178.81 - - [23/Jun/2009:12:41:57 -0700] "-" 400 0 "-" "-" 0.000
117.99.178.81 - - [23/Jun/2009:12:41:57 -0700] "-" 400 0 "-" "-" 0.000
117.99.178.81 - - [23/Jun/2009:12:41:57 -0700] "-" 400 0 "-" "-" 0.000
117.99.178.81 - - [23/Jun/2009:12:41:57 -0700] "-" 400 0 "-" "-" 0.000
117.99.178.81 - - [23/Jun/2009:12:41:57 -0700] "-" 400 0 "-" "-" 0.000

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