Please Help... I am trying to manipulte the following line

Before :
<user:Account_Password>002786</user:Account_Password>

the password is the "variable", i need to delete / omit the password in the file, (it occurs several thousand times)
so the tag line looks like

After:
<user:Account_Password></user:Account_Password>

how can this be accomplished using sed commands.

I have been trying to resolve this for about 2 days, i am a novice to sed and now i am reaching out to the experts.