Found towards the beginning of the level. When you progress further up the streets a truck will break through the wooden gates. Continue past the gate and head through the first building you see to the right. You'll find the Intel item within the second room of the building sitting on the table.
Enemy Intel Item #16
As the level progress you'll end up in an open area Cliffside after passing through the two alleyways. Before heading up the hill, observe the wooden stand to the right. Sitting on one of the oil canisters lies the second Intel item of the level.
Enemy Intel Item #17
You'll find the third Intel item of midway through the level. While tracking uphill, turn to the building to the right (you'll easily indentify the building when you see the small parked blue car). Once inside, head up the stairs. You'll see the Intel item is sitting on the table to the left.
Enemy Intel Item #18
The last Intel item is located in the central open area before heading up the rooftops. Upon exiting the previous building, head over to the opposite soccer goal post. Behind the goal post you'll see the Intel item sitting on the window sill.