'Transformers 4' takes Fourth of July weekend box office

LOS ANGELES, July 6 (UPI) -- Transformers 4, which opened to $100 million last weekend, claimed the top box-office spot during an otherwise lackluster Fourth of July.

The Michael Bay robot franchise, headlined by Mark Wahlberg instead of Shia LaBeouf, took in $36.4 million in its second week, bringing the film's two-week domestic total to $175 million.

Melissa McCarthy's heavily promoted but critically panned comedy, Tammy, failed to live up to studio estimates, bringing in $32.9 million over the five-day weekend.

The film only cost $20 million to make, but it's McCarthy's worst-ever opening. The Heat, also starring Sandra Bullock, earned $39 million in its first weekend, while Identity Thief, with Jason Bateman, took in $34.6 million.

"There's nothing wrong here," Warner Bros. distribution chief Dan Fellman told THR. "It's true that tracking was more favorable for us going into the weekend, but this was a $20 million movie. This is a movie Melissa did by herself with her husband. It doesn't have a big supporting star like Sandy [Bullock]."

Horror film Deliver Us From Evil, another weekend opener, came in third with $15 million for five days, while 22 Jump Street, last month's success story, took in $9.4 million.

Earth to Echo, Disney's alien robot story, placed sixth with $8.25 million.