loose spokes - dangerous??

bossman13 Posts: 106
edited December 2007 in Road beginners
just checking my bike over when i got back from commute this evening and found two loose spokes on the back wheel. dont know the first thing about bike maintenance but found that the end had come unscrewed from the rim and was therefore pushed into the rim (if that makes sense?)

re-screwed them in by hand and then tightened with some pliers. is this safe to ride still?

even if they came loose again the bike seemed to ride ok. could loose spokes cause any real damage / accident?

hope not as desperate to ride in 2mor!