Reuters reports missiles from U.S. drones hit a gathering of militants and a suspected training camp in northwest Pakistan in two separate attacks on Tuesday, killing at least 8 people, intelligence officials said. Attacks by U.S. drones have intensified in recent months after a pause in the first half of this year. Tuesday's attacks mark the third and fourth drone strike in three days. In the first attack, three missiles from the unmanned aircraft hit a suspected training camp in the Shawal area of North Waziristan just after midday, two Pakistani intelligence officials told Reuters. Six suspected militants were reported killed and nine injured, they said. In the second attack, missiles hit a gathering of militants on a mountain in the Datta Khel region in North Waziristan, killing two people and wounding at least four on Tuesday evening, said Pakistani intelligence officials.