“The main reason behind all these attacks are the signs of improvement of the security situation mentioned in the Crocker-Petraeus report,” said Tahseen al-Sheikhly, the Iraqi spokesman for the security plan, in a reference to the recent Congressional testimony of General Petraeus and the American ambassador to Iraq, Ryan C. Crocker. “The terrorist groups are just trying to say to the world that the report did not reflect the reality of the security situation in Iraq.” Mr. Sheikhly played down the recent violence, though, saying the groups were seeking publicity to compensate for their inability to conduct major offensive operations, which have been sharply curtailed by the surge. Indeed, the enormous car and truck bombs that plagued Baghdad for so long have been absent in recent weeks. But the string of attacks this week served as a reminder of the insurgency’s persistence, particularly in areas outside of Baghdad and its environs.