INDIANAPOLIS (AP) _ Two shoppers suspected of having a stolen credit card shot and seriously wounded two security guards who tried to apprehend them in a department store Monday, authorities said.

Customers and employees screamed and dove to the floor when shots rang out Monday afternoon at the Lazarus Department Store in Glendale Mall.

''I heard a lot of screaming,'' said salesman John Langdon. ''I heard the gunshots and the glass breaking, people hitting the floor and just screaming.''

Police spokeswoman Wendy Snitko said five people went to the store's handbag department, and two tried to use a credit card to buy clothing.

The clerk checked the card number, found that it had been stolen and alerted security. Two unarmed plainclothes security officers answered the call.

''We're not sure what caused the suspects to shoot,'' she said. ''One of the male suspects fired two shots, each shot striking one of the security guards.''

Randall Wright, 30, was in serious condition at Methodist Hospital with a gunshot wound to the stomach. The other guard, Eric D. Simmons, 25, was in serious but stable condition at Wishard Hospital with a chest wound.

Ms. Snitko said the clerk was not injured.

Two men and a woman were arrested, and police were seeking two other suspects, including a man believed to be the trigger man. No charges had been filed.