For the fifth time since late August, a woman walked into a Washington-area bank yesterday, declared she was carrying a hand grenade and demanded money.

Unlike the previous occasions, the woman departed without getting any money, Fairfax County police reported.

Yesterday's holdup attempt occurred at the First Virginia Bank branch at 5871 Leesburg Pike in Baileys Crossroads just after 11 a.m., police said.

The woman demanded cash from a particular money drawer, according to police, and was told by a teller that it contained no money. When the woman insisted, the teller opened the drawer, showing that it was indeed empty.

Police said the would-be robber then walked out of the bank.

In four previous holdups, three in Annandale and one in Wheaton, a woman displayed a sock containing a lemon-shaped object that she said was a grenade, and in each case walked off with an undisclosed amount of cash. Police said no such object was displayed yesterday.

As previously, police said, the woman was wearing a gray sweater and beret and carrying a shoulder bag.

They said she has apparently abandoned the practice of wearing purple sneakers, which were evident in the first three robberies.