[JimmyCh]

Well we can do that in many ways..
One of the ways would be: (Just giving an example now).

pawn Код:

for(new i=0; i<MAX_PLAYERS; i++)
{
if(IsPlayerInRangeOfPoint(i, 10, X, Y, Z)) // Change X Y Z to the coordinates you wanted.
{
new Float:PosX, Float:PosY, Float:PosZ;
GetPlayerPos(i, PosX, PosY, PosZ);
CreateExplosion(PosX, PosY, PosZ, type, radius) // Change type and radius to your needs, scroll down for the "type" link.
}
}

Click here for the list of "types".